AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.google.firebase.quickstart.fcm">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <application
      android:name=".MainApplication"
      android:allowBackup="true"
      android:label="@string/app_name"
      android:icon="@mipmap/ic_launcher"
      android:theme="@style/AppTheme">

        <service android:name="io.invertase.firebase.messaging.RNFirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>
        <service android:name="io.invertase.firebase.messaging.RNFirebaseInstanceIdService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
            </intent-filter>
        </service>

        <service android:name="io.invertase.firebase.messaging.RNFirebaseBackgroundMessagingService" />

        <receiver android:name="io.invertase.firebase.notifications.RNFirebaseNotificationReceiver"/>
        <receiver android:enabled="true" android:exported="true"  android:name="io.invertase.firebase.notifications.RNFirebaseNotificationsRebootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
                <action android:name="android.intent.action.QUICKBOOT_POWERON"/>
                <action android:name="com.htc.intent.action.QUICKBOOT_POWERON"/>
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>
      <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:launchMode="singleTop"
        android:configChanges="keyboard|keyboardHidden|orientation|screenSize">

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

      </activity>
      <activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />


        <meta-data
            android:name="com.google.firebase.messaging.default_notification_icon"
            android:resource="@mipmap/ic_notif" />

        <meta-data
            android:name="com.google.firebase.messaging.default_notification_channel_id"
            android:value="test-channel"/>
    </application>

</manifest>