The Firebase Blog: Introducing Firebase Notifications
How to test Firebase Cloud Messaging (FCM) Push Notification to Android devices using POSTMAN and AWS Simple Notification Service (SNS) – A Turning Point
The Firebase Blog: Creating visual notifications with Firebase Cloud Messaging
Firebase console : Project Settings option not showing tabs for "General", "Cloud Messaging", "Analytics" when logged in from safari (v 9.1.2) - Stack Overflow
Firebase Cloud Messaging - Xamarin | Microsoft Docs
Push Notifications (FCM)
Complete guide on sending Push using Firebase Cloud Messaging Console