code: public ApiSuccessResponse merge(String id, MergeData mergeData) throws ApiException {
          ApiResponse<ApiSuccessResponse> resp = mergeWithHttpInfo(id, mergeData);
          return resp.getData();
      }
docs: Merge two calls
  Merge the two specified calls.
  @param id The connection ID of the first call to be merged. (required)
  @param mergeData  (required)
  @return ApiSuccessResponse
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body