code: public List<PrebuiltDomain> listAvailableCustomPrebuiltDomainsForCulture(String culture) {
          return listAvailableCustomPrebuiltDomainsForCultureWithServiceResponseAsync(culture).toBlocking().single().body();
      }
docs: Gets all the available custom prebuilt domains for a specific culture.
  
  @param culture Culture.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorResponseException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the List&lt;PrebuiltDomain&gt; object if successful.