src/main/java/com/authlete/jaxrs/api/AuthleteApiImpl.java
@Override
    public BackchannelAuthenticationFailResponse backchannelAuthenticationFail(BackchannelAuthenticationFailRequest request) throws AuthleteApiException
    {
        return executeApiCall(
                new ServicePostApiCaller<BackchannelAuthenticationFailResponse>(
                        BackchannelAuthenticationFailResponse.class, request, BACKCHANNEL_AUTHENTICATION_FAIL_API_PATH));
    }
@Override
    public BackchannelAuthenticationFailResponse backchannelAuthenticationFail(BackchannelAuthenticationFailRequest request) throws AuthleteApiException
    {
        return executeApiCall(
                new ServicePostApiCaller<BackchannelAuthenticationFailResponse>(
                        BackchannelAuthenticationFailResponse.class, request, BACKCHANNEL_AUTHENTICATION_FAIL_API_PATH));
    }
Call {@code /api/backchannel/authentication/fail} API.