10.4 Messaging
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Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably send messages at no cost.
Firebase In-App Messaging helps you engage your app's active users by sending them targeted, contextual messages that encourage them to use key app features. For example, you could send an in-app message to get users to subscribe, watch a video, complete a level, or buy an item. You can customize messages as cards, banners, modals, or images, and set up triggers so that they appear exactly when they'd benefit your users most.
To use In-App Messaging, you must first add it's SDK to your Android app (make sure your Firebase project is set up, the steps of which are covered in the first section 11.1 and that your analytics are set up, covered in 11.3!)
When creating a notification, you can test it by specifying something called the installation ID:
To conserve power, Firebase In-App Messaging only retrieves messages from the server once per day. That can make testing difficult, so the Firebase console allows you to specify a test device that displays messages on demand.
To create an In-app message campaign, visit where you can specify how your notification should look like, and who to target based on any created users from Audiences or specific event triggers from setting up your Analytics!
That testing device is determined by a ID, or FID. Find your testing app's FID by checking the Logcat in Android Studio for the following `Info` level log:
