| If an alias is provided, we need to use its value and subscribe to FCM topic, similar like done here: https://github.com/aerogear/aerogear-android-push/blob/master/aerogear-android-push/src/main/java/org/jboss/aerogear/android/unifiedpush/fcm/AeroGearFCMPushRegistrar.java#L188-L193 |