What is FCM token in iOS?

Getting FCM token By default, the FCM SDK generates a registration token for the client app instance on initial startup of your app . Similar to the APNs device token, this token allows you to target notification messages to this particular instance of the app.

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What is FCM push notification?

Using FCM, you can notify a client app that new email or other data is available to sync . You can send notification messages to drive user re-engagement and retention. For use cases such as instant messaging, a message can transfer a payload of up to 4000 bytes to a client app.

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