Time to Upgrade from GCM to FCM

In April 2018, Jen Person announced on the Firebase Blog that Firebase Cloud Messaging (FCM) would replace Google Cloud Messaging (GCM), with a deadline for migration set for April 11, 2019. FCM offers enhanced features over GCM, including an intuitive notifications interface, better reporting, and integration with other Firebase products like A/B Testing and Predictions, enabling more targeted and efficient user engagement. To facilitate the transition, a detailed migration guide was provided, outlining necessary changes to console-side, app-side, and server-side elements. Developers were reassured that existing GCM tokens would remain functional with FCM, ensuring uninterrupted message delivery. The blog emphasized FCM's backward compatibility with GCM, allowing developers to upgrade at their own pace and encouraged them to utilize available resources and support channels for a smooth transition.