How does FCM push notification work?

Services like Google’s Firebase Cloud Messaging (FCM) and Apple’s APNS are the basis for push notifications.
These services enable notifications in Safari and Windows Notification Service for Microsoft Edge.

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FCM is a messaging solution that allows websites and mobile applications to send push notifications to subscribers. The subscriber’s data is sent to the FCM together with the notification content via App Server. The information is then verified by the FCM and sends notifications to the end user’s devices. The important data such as total clicks, total views and other relevant data are then sent to the application server via devices.

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