code: @Override
      public BackchannelAuthenticationResponse backchannelAuthentication(BackchannelAuthenticationRequest request) throws AuthleteApiException
      {
          return executeApiCall(
                  new ServicePostApiCaller<BackchannelAuthenticationResponse>(
                          BackchannelAuthenticationResponse.class, request, BACKCHANNEL_AUTHENTICATION_API_PATH));
      }
docs: Call {@code /api/backchannel/authentication} API.