Google Cloud Messages & Firebase SDK need updating as when the app targets Android versions after Q, notifications will no longer work. Below is the email from Google Firebase.
You are receiving this message because you are an owner of Firebase projects that sent a message via the Google Cloud Messaging (GCM) endpoint in the last 28 days.
Last year we announced that the GCM server and client APIs are deprecated. To prevent a disruption in your service, you must redirect your Cloud Messaging server requests to the Firebase Cloud Messaging (FCM) endpoint at fcm.googleapis.com/fcm/ before May 29, 2019.
We also recommend that you upgrade your client SDKs from GCM to the latest version of Firebase Cloud Messaging. Although existing app installations that use GCM methods will continue to function, GCM methods will not work when your app targets future Android versions (after Android Q).
What do I need to do?
The projects listed below have used GCM in the past month. To continue sending messages for these projects, update server endpoints and upgrade any apps associated with these projects to the FCM SDK. In some cases, the endpoints below may be hostnames that were previously deprecated. However, you should still migrate away from them by May 29, 2019.
A complete overview of the steps you need to take to upgrade GCM to FCM can be found here for iOS and here for Android. If you use GCM for web, you only need to update server endpoints (more information here). You can also check out this video, which walks you through the migration process for Android.
If you have questions that aren’t answered in the documentation, take a look at the Cloud Messaging FAQs on our support page or reach out to us through one of our other support channels.
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voteUpdate Google Cloud Messages - Firebase
You are receiving this message because you are an owner of Firebase projects that sent a message via the Google Cloud Messaging (GCM) endpoint in the last 28 days.
Last year we announced that the GCM server and client APIs are deprecated. To prevent a disruption in your service, you must redirect your Cloud Messaging server requests to the Firebase Cloud Messaging (FCM) endpoint at fcm.googleapis.com/fcm/ before May 29, 2019.
We also recommend that you upgrade your client SDKs from GCM to the latest version of Firebase Cloud Messaging. Although existing app installations that use GCM methods will continue to function, GCM methods will not work when your app targets future Android versions (after Android Q).
What do I need to do?
The projects listed below have used GCM in the past month. To continue sending messages for these projects, update server endpoints and upgrade any apps associated with these projects to the FCM SDK. In some cases, the endpoints below may be hostnames that were previously deprecated. However, you should still migrate away from them by May 29, 2019.
A complete overview of the steps you need to take to upgrade GCM to FCM can be found here for iOS and here for Android. If you use GCM for web, you only need to update server endpoints (more information here). You can also check out this video, which walks you through the migration process for Android.
If you have questions that aren’t answered in the documentation, take a look at the Cloud Messaging FAQs on our support page or reach out to us through one of our other support channels.