plugins { id("com.android.application") version "7.3.0" apply false  // ...  
**// Add the dependency for the Google services Gradle plugin**
id("com.google.gms.google-services") version "4.4.0" apply false
}

plugins { id("com.android.application")  
 **// Add the Google services Gradle**
 plugin id("com.google.gms.google-services")
}

dependencies 
{  
**// Import the Firebase BoM implementation(platform("com.google.firebase:firebase-bom:32.7.1"))**  // When using the BoM, you don't specify versions in Firebase library dependencies 
**// Add the dependency for the Firebase SDK for Firebase Cloud Messaging(FCM)**  
implementation("com.google.firebase:firebase-messaging")
**// TODO: Add the dependencies for Firebase products you want to use**  // See https://firebase.google.com/docs/android/setup#available-libraries  
//For example, add the dependencies for Firebase Authentication and Cloud Firestore 
implementation("com.google.firebase:firebase-auth") implementation("com.google.firebase:firebase-firestore")  
}

<service  
  android:name=".fcm.MyFirebaseMessagingService"  
  android:exported="false">  
	<intent-filter>
		 <action android:name="com.google.firebase.MESSAGING_EVENT" />  
	</intent-filter>
</service>

<!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->  
<meta-data  android:name="com.google.firebase.messaging.default_notification_icon"
android:resource="@drawable/ic_stat_ic_notification"  />  
<!-- Set color used with incoming notification messages. This is used when no color is set for the incoming  
     notification message. -->  
<meta-data  android:name="com.google.firebase.messaging.default_notification_color"
android:resource="@color/colorAccent"  />

<meta-data  android:name="com.google.firebase.messaging.default_notification_channel_id"  
android:value="@string/default_notification_channel_id"  />

// Declare the launcher at the top of your Activity/Fragment:  
private  val requestPermissionLauncher = registerForActivityResult(  ActivityResultContracts.RequestPermission(),)
{ isGranted:  Boolean  ->  if  (isGranted)  
{  
// FCM SDK (and your app) can post notifications.  
}  
else  
{  // TODO: Inform user that that your app will not show notifications.  
}  
}  
  
private  fun askNotificationPermission()  {
  // This is only necessary for API level >= 33 (TIRAMISU)  
  if  (Build.VERSION.SDK_INT >=  Build.VERSION_CODES.TIRAMISU)  
  {  
  if  (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS)  ==  PackageManager.PERMISSION_GRANTED )  
  {  
  // FCM SDK (and your app) can post notifications.  
  }  
  else  if  (shouldShowRequestPermissionRationale(Manifest.permission.POST_NOTIFICATIONS))  
  {  // TODO: display an educational UI explaining to the user the features that will be enabled  
  //       by them granting the POST_NOTIFICATION permission. This UI should provide the user  
  //       "OK" and "No thanks" buttons. If the user selects "OK," directly request the permission.  
  //       If the user selects "No thanks," allow the user to continue without notifications.  
  }  else  
  {  
  // Directly ask for the permission requestPermissionLauncher.launch(Manifest.permission.POST_NOTIFICATIONS)  
  }  
  }  
}

Firebase.messaging.token.addOnCompleteListener(  
    OnCompleteListener { task ->  
  if (!task.isSuccessful) {  
            Log.w(TAG, "Fetching FCM registration token failed", task.exception)  
            return@OnCompleteListener  
  }  
  
  // Get new FCM registration token  
  val token = task.result  
  
  // Log and toast  
  val msg = getString(R.string.msg_token_fmt, token)  
        Log.d(TAG, msg)  
  
   //Implement this method to send token to your app server.  
  Log.d("MainActivity" ,"sendRegistrationTokenToServer($token)")  
 })

/**  
 * Called if the FCM registration token is updated. This may occur if the security of * the previous token had been compromised. Note that this is called when the * FCM registration token is initially generated so this is where you would retrieve the token. */
 override fun onNewToken(token: String) {  
	Log.d(TAG, "Refreshed token: $token")  
  
 // If you want to send messages to this application instance or  
 // manage this apps subscriptions on the server side, send the // FCM registration token to your app server. 
 sendRegistrationToServer(token)  
}