The rest of this post is about how you can do this using only Firebase.
Read moreHow do you use notifications on flutter?
Displaying a notification in Flutter To display a notification, we need to create a platform-specific NotificationDetails instance , which takes in arguments that are unique to each platform. AndroidNotificationDetails handles the configuration of notifications in Android devices.
Read moreHow do I push notifications on Flutter?
How to Add Push Notifications to a Flutter App using Firebase Cloud Messaging
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