@Override
    protected void doInitialize() {
        val loginFlow = getLoginFlow();
        if (loginFlow != null) {
            val state = getTransitionableState(loginFlow, CasWebflowConstants.STATE_ID_VIEW_LOGIN_FORM, ViewState.class);
            state.getEntryActionList().add(createEvaluateAction(CasWebflowConstants.ACTION_ID_OAUTH20_REGISTERED_SERVICE_UI));
        }
    }
This is {@link OAuth20WebflowConfigurer}.

@author Misagh Moayyed
@since 5.0.0
support/cas-server-support-oauth-webflow/src/main/java/org/apereo/cas/support/oauth/web/flow/OAuth20WebflowConfigurer.java