@Override
    public String getId() {
        return StringUtils.defaultIfBlank(super.getId(), CasTwilioMultifactorAuthenticationProperties.DEFAULT_IDENTIFIER);
    }
This is {@link CasTwilioMultifactorAuthenticationProvider}.

@author Misagh Moayyed
@since 7.2.0
support/cas-server-support-twilio-mfa/src/main/java/org/apereo/cas/mfa/twilio/CasTwilioMultifactorAuthenticationProvider.java