Your server environment and FCM | Firebase Documentation
Firebase Cloud Messaging - Xamarin | Microsoft Docs
How to test Firebase Cloud Messaging (FCM) Push Notification to Android devices using POSTMAN and AWS Simple Notification Service (SNS) – A Turning Point
Send push notifications from Spring Boot server-side application using FCM - Mestwin Blog
Google Firebase Cloud Messaging or Push Notification Integration in Android Apps, Send RealTime Messages in Android App | by Android Code Lab | AndroidCodeLab | Medium
Firebase Cloud Messaging (FCM) - Everything You Need To Know
Firebase Cloud Messaging - Wikiwand
Android Developers Blog: Notifying your users with FCM
The Firebase Blog: Handle FCM messages on Android
Push Notifications (FCM)
On the performance of web services, google cloud messaging and firebase cloud messaging - ScienceDirect