Firebase Cloud Messaging

Integrate Firebase Cloud Messaging in your app to support Engagement push notifications on Android devices

To be able to send push notifications from the Engagement platform and receive them in your app on Android devices, you must set up a Firebase project, implement Firebase messaging in your app, and configure the Firebase Cloud Messaging integration in the Engagement web app.


The SDK provides a push setup self-check feature to help developers successfully set up push notifications. The self-check will try to track the push token, request the Engagement backend to send a silent push to the device, and check if the app is ready to open push notifications.

To enable the setup check, set Exponea.checkPushSetup = true before initializing the SDK.

We suggest you turn the self-check feature on while implementing the push notifications for the first time or if you need to do some troubleshooting.

Set up Firebase

First, you must set up a Firebase project. For step-by-step instructions, please refer to Add Firebase to your Android project in the official Firebase documentation.

To summarize, you'll create a project using the Firebase console, download a generated google-services.json configuration file and add it to your app, and update the Gradle build scripts in your app.


  • The google-services.json file downloaded from the Firebase console is in your application folder, for example, my-project/app/google-services.json.
  • Your application Gradle build file (for example, my-project/app/build.gradle) contains apply plugin: ''.
  • Your top level Gradle build file (for example, my-project/build.gradle) has classpath '' listed in build script dependencies.

Implement Firebase Messaging in Your App

Next, you must create and register a service that extends FirebaseMessagingService. The SDK's automatic tracking relies on your app providing this implementation.


This implementation is not included in the SDK in order to keep it as small as possible and avoid including the libraries that are not essential for its functionality. You can copy the example code below and use it in your app.

  1. Create the service:

     import android.content.Context  
     import com.exponea.sdk.Exponea  
     class MyFirebaseMessagingService: FirebaseMessagingService() {
         private val notificationManager by lazy {
             getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
         override fun onMessageReceived(message: RemoteMessage) {
             if (!Exponea.handleRemoteMessage(applicationContext,, notificationManager)) {
                 // push notification is from another push provider
         override fun onNewToken(token: String) {
             Exponea.handleNewToken(applicationContext, token)
  2. Register the service in AndroidManifest.xml:

     <service android:name="MyFirebaseMessagingService" android:exported="false" >  
             <action android:name="" />  

The SDK will only handle push notification messages sent from the Engagement platform. A helper method Exponea.isExponeaPushNotification() is also provided.

If you run the app, the SDK should the track push token to the Engagement platform. If you enabled the self-check, it will you inform you of this. Alternatively, you can find the customer in the Engagement web app and check the customer property google_push_notification_id.


If you are integrating a new Firebase project in an existing project, or if you are changing Firebase project completely, you may face an issue that your 'FirebaseMessagingService' is not called automatically.

To retrieve a fresh FCM token, consider requesting a token manually as soon as possible after Firebase initialization:

import com.exponea.sdk.Exponea

class ExponeaApp : Application() {
    override fun onCreate() {
       FirebaseMessaging.getInstance().token.addOnSuccessListener {
           Exponea.handleNewToken(applicationContext, it)


The methods Exponea.handleNewToken and Exponea.handleRemoteMessage can be used before SDK initialization if a previous initialization was done. In such a case, each method will track events with the configuration of the last initialization. Consider initializing the SDK in Application::onCreate to make sure a fresh configuration is applied in case of an application update.

Configure the Firebase Cloud Messaging Integration in Engagement

Finally, you must configure the Firebase Cloud Messaging integration in Engagement so the platform can use it to send push notifications.

The setup requires you to use a private key from a Service Account that you create in Google Cloud and then copy-paste that key into the integration authentication in Bloomreach Engagement.

Follow the steps below:

  1. Create a service account. To create a new service account in Google Cloud, navigate to Service Accounts and choose your project. On the Service Accounts page, select Create Service Account. It is possible to use roles to define more granular access.

  2. Generate a new private key. Locate the FCM service account you created in the previous step, then select Actions > Manage Keys. Select Add Key > Create new key. Download the JSON key file.

  3. Add the Firebase Cloud Messaging integration to your Engagement project. In Engagement, navigate to Data & Assets > Integration. Click on Add new integration and select Firebase Cloud Messaging for sending push notifications via the push notification node. Please note that if you’d like to send push notifications via webhooks, you must select Firebase Service Account Authentication instead.

  4. Insert the key from step 2 into the Firebase Cloud Messaging integration settings page in the Service Account JSON Credentials field. Click on Save integration.

  5. Select the Firebase Cloud Messaging integration in Project Settings > Channels > Push notifications > Firebase Cloud Messaging integration. Click on Save changes.

The Engagement platform should now be able to send push notifications to Android devices via the push notification node.


  • If you run the app, the self-check should be able to send and receive a silent push notification.
  • You should now be able to send push notifications using the Engagement web app and receive them in your app. Refer to Mobile Push Notifications to learn how to create push notifications in the Engagement web app.
  • Send a test push notification from Engagement to the device and tap on it. Your broadcast receiver should be called.


The Engagement service for sending push notifications and the Firebase connection may take a minute to wake up properly. If sending a push notification fails, try restarting the app. If the issue persists after 2-3 retries, review your setup.

You should now be able to use Engagement push notifications. You may disable the self-check or leave it on to check your push setup in every debug build run.