code: @Override
      public BackchannelAuthenticationCompleteResponse backchannelAuthenticationComplete(BackchannelAuthenticationCompleteRequest request) throws AuthleteApiException
      {
          return executeApiCall(
                  new ServicePostApiCaller<BackchannelAuthenticationCompleteResponse>(
                          BackchannelAuthenticationCompleteResponse.class, request, BACKCHANNEL_AUTHENTICATION_COMPLETE_API_PATH));
      }
docs: Call {@code /api/backchannel/authentication/complete} API.