code: public Observable<ServiceResponse<List<UUID>>> addCustomPrebuiltDomainWithServiceResponseAsync(UUID appId, String versionId, AddCustomPrebuiltDomainModelsOptionalParameter addCustomPrebuiltDomainOptionalParameter) {
          if (this.client.endpoint() == null) {
              throw new IllegalArgumentException("Parameter this.client.endpoint() is required and cannot be null.");
          }
          if (appId == null) {
              throw new IllegalArgumentException("Parameter appId is required and cannot be null.");
          }
          if (versionId == null) {
              throw new IllegalArgumentException("Parameter versionId is required and cannot be null.");
          }
          final String domainName = addCustomPrebuiltDomainOptionalParameter != null ? addCustomPrebuiltDomainOptionalParameter.domainName() : null;
  
          return addCustomPrebuiltDomainWithServiceResponseAsync(appId, versionId, domainName);
      }
docs: Adds a customizable prebuilt domain along with all of its models to this application.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param addCustomPrebuiltDomainOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;UUID&gt; object