code: public ApiResponse<ApiSuccessResponse> attachUserDataWithHttpInfo(String id, UserDataOperationId userData) throws ApiException {
          com.squareup.okhttp.Call call = attachUserDataValidateBeforeCall(id, userData, null, null);
          Type localVarReturnType = new TypeToken<ApiSuccessResponse>(){}.getType();
          return apiClient.execute(call, localVarReturnType);
      }
docs: Attach user data to a call
  Attach the provided data to the specified call. This adds the data to the call even if data already exists with the provided keys.
  @param id The connection ID of the call. (required)
  @param userData The data to attach to the call. This is an array of objects with the properties key, type, and value. (required)
  @return ApiResponse&lt;ApiSuccessResponse&gt;
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body