code: public ApiSuccessResponse retrieve(String id, RetrieveData retrieveData) throws ApiException {
          ApiResponse<ApiSuccessResponse> resp = retrieveWithHttpInfo(id, retrieveData);
          return resp.getData();
      }
docs: Retrieve a call from hold
  Retrieve the specified call from hold.
  @param id The connection ID of the call. (required)
  @param retrieveData Request parameters. (optional)
  @return ApiSuccessResponse
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body