code: public ApiSuccessResponse singleStepTransfer(String id, SingleStepTransferData singleStepTransferData) throws ApiException {
          ApiResponse<ApiSuccessResponse> resp = singleStepTransferWithHttpInfo(id, singleStepTransferData);
          return resp.getData();
      }
docs: Transfer a call in a single step
  Perform a single-step transfer to the specified destination.
  @param id The connection ID of the call to transfer. (required)
  @param singleStepTransferData  (required)
  @return ApiSuccessResponse
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body