code: @Override
      public BackchannelAuthenticationFailResponse backchannelAuthenticationFail(BackchannelAuthenticationFailRequest request) throws AuthleteApiException
      {
          return executeApiCall(
                  new ServicePostApiCaller<BackchannelAuthenticationFailResponse>(
                          BackchannelAuthenticationFailResponse.class, request, BACKCHANNEL_AUTHENTICATION_FAIL_API_PATH));
      }
docs: Call {@code /api/backchannel/authentication/fail} API.