Messaging

Messaging feature — interact with Firebase Cloud Messaging (FCM) through AFCore.

This interface provides operations for:

• Managing device tokens (register, update, delete).

• Requesting notification permissions.

• Subscribing/unsubscribing to topics.

• Receiving foreground data messages.

• Configuring notification presentation options.

Platform & threading

• All suspend functions must be called from a coroutine.

• Errors surface as Throwable and should be handled at call sites.

Typical flows

• Token lifecycle: use updateToken or deleteToken when device state changes.

• Topics: use subscribe / unsubscribe for group notifications.

• Foreground messages: observe messages for in-app handling.