How to get One Signal unique user id in Mobile?

Got the unique Id of OneSignal by using the following code which is in official site of OneSignal.

OneSignal.idsAvailable(new OneSignal.IdsAvailableHandler() {
        @Override
        public void idsAvailable(String userId, String registrationId) {
            Log.d("debug", "User:" + userId);
            if (registrationId != null)
                Log.d("debug", "registrationId:" + registrationId);

        }
    });

Refer:

Getting code in Official Site

This Above Code is Deprecated. Please use the below code.

String UUID = OneSignal.getPermissionSubscriptionState().getSubscriptionStatus().getUserId()