code: public ApiSuccessResponse deleteUserDataPair(String id, KeyData keyData) throws ApiException {
          ApiResponse<ApiSuccessResponse> resp = deleteUserDataPairWithHttpInfo(id, keyData);
          return resp.getData();
      }
docs: Remove a key/value pair from user data
  Delete data with the specified key from the call&#39;s user data.
  @param id The connection ID of the call. (required)
  @param keyData  (required)
  @return ApiSuccessResponse
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body