Half of the equasion - Group messages so users are not flooded

Thanks to Shruti for pointing this out. Here is the code for clarity.

Service Worker Code

messaging.onBackgroundMessage((payload) => {
    console.log('Background Message recieved', payload);

    const notificationTitle = payload.data.title;
    const notificationOptions = {
        body: payload.data.body,
        tag: '<A TAG>',
        renotify: true,
        icon: '/images/icons-192.png',
        data: {
            url: "/"
        }
    }
    self.registration.showNotification(notificationTitle, notificationOptions);
});