It’s been a long, long time since I messed around with Google’s push notification messaging. In fact, the last time I played around with it, it was still called “C2DM,” or Cloud to Device Messaging. Since that time, “GCM,” or Google Cloud Messaging was introduced. And even that is superseded by Google’s new Firebase (FCM) messaging. The most recent iteration is very interesting since it’s cross-platform and directly supports iOS, Android, and Web notifications.