code: public ApiResponse<ApiSuccessResponse> singleStepTransferWithHttpInfo(String id, SingleStepTransferData singleStepTransferData) throws ApiException {
          com.squareup.okhttp.Call call = singleStepTransferValidateBeforeCall(id, singleStepTransferData, null, null);
          Type localVarReturnType = new TypeToken<ApiSuccessResponse>(){}.getType();
          return apiClient.execute(call, localVarReturnType);
      }
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 ApiResponse&lt;ApiSuccessResponse&gt;
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body