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A client app must first register with FCM before messaging can take place.

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This feature can be used for messages such as weather alerts, stock quotes, and headline news.

The following steps are used in topic messaging (after the client app obtains a registration token as explained earlier): For more information about Firebase topic messaging, see Google's Topic Messaging on Android.

The app server can send an acknowledgement back to the client app to indicate that the registration token was received.

After this handshake takes place, the client app can receive messages from (or send messages to) the app server.

Before you can use FCM services in your app, you must create a new project (or import an existing project) via the Firebase Console.

Use the following steps to create a Firebase Cloud Messaging project for your app: This article provided an overview of Firebase Cloud Messaging (FCM).

Firebase Cloud Messaging (FCM) is a cross-platform service that handles the sending, routing, and queueing of messages between server applications and mobile client apps.

FCM is the successor to Google Cloud Messaging (GCM), and it is built on Google Play Services.

FCM uses the following credentials to identify the app server and the client app, and it uses these credentials to authorize message transactions through FCM: Setting Up Firebase Cloud Messaging (later in this guide) provides detailed instructions for creating a project and generating these credentials.

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