Now in index. html of web folder in your flutter project, update your code as below.
Read moreHow do I enable push notifications in PWA?
How to integrate Push Notifications into your PWA
Read moreWhat is Firebase messaging in Flutter?
Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably send messages at no cost . Using FCM, you can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention.
Read moreIs FCM completely free?
Firebase Cloud Messaging (FCM) provides a reliable and battery-efficient connection between your server and devices that allows you to deliver and receive messages and notifications on iOS, Android, and the web at no cost .
Read more