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Deletes the registration token associated with this FirebaseMessaging instance and unsubscribes the FirebaseMessaging instance from the push subscription.
Subscribes the FirebaseMessaging instance to push notifications. Returns an Firebase Cloud Messaging registration token that can be used to send push messages to that FirebaseMessaging instance.If a notification permission isn't already granted, this method asks the user for permission. The returned promise rejects if the user does not allow the app to show notifications.
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When a push message is received and the user is currently on a page for your origin, the message is passed to the page and an onMessage() event is dispatched with the payload of the push message.
Message payload that contains the notification payload that is represented with NotificationPayload and the data payload that contains an arbitrary number of key-value pairs sent by developers through the Send API