@JsonIgnore
    default boolean isProviderAllowed(final String provider, final RegisteredService registeredService) {
        return true;
    }
Is provider allowed to process the request for this service.

@param provider          the provider
@param registeredService the registered service
@return true /false
api/cas-server-core-api-services/src/main/java/org/apereo/cas/services/RegisteredServiceDelegatedAuthenticationPolicy.java