FirebaseInstanceId Firebase Instance ID provides a unique identifier for each app instance and a mechanism to authenticate and authorize actions (example: sending FCM messages). 
FirebaseInstanceIdInternalReceiver Internal receiver for FirebaseInstanceId used to start services securely. 
FirebaseInstanceIdReceiver WakefulBroadcastReceiver that receives FirebaseInstanceId and FirebaseMessaging events and delivers them to the application-specific FirebaseInstanceIdService subclass. 
FirebaseInstanceIdService Base class to handle Firebase Instance ID token refresh events. 

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