code: public ApiResponse<ApiSuccessResponse> completeConferenceWithHttpInfo(String id, CompleteConferenceData completeConferenceData) throws ApiException {
          com.squareup.okhttp.Call call = completeConferenceValidateBeforeCall(id, completeConferenceData, null, null);
          Type localVarReturnType = new TypeToken<ApiSuccessResponse>(){}.getType();
          return apiClient.execute(call, localVarReturnType);
      }
docs: Complete a conference
  Complete a previously initiated two-step conference identified by the provided IDs. Once completed, the two separate calls are brought together so that all three parties are participating in the same call.
  @param id The connection ID of the consult call (established). (required)
  @param completeConferenceData  (required)
  @return ApiResponse&lt;ApiSuccessResponse&gt;
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body