As of April 10, 2018, Google has deprecated GCM. The GCM server and client APIs are deprecated and will be removed as soon as April 11, 2019. Migrate GCM apps to Firebase Cloud Messaging (FCM), which inherits the reliable and scalable GCM infrastructure, plus many new features. See the migration guide to learn more.

GCM and FCM Frequently Asked Questions

We’ve deprecated GCM, integrated Cloud Messaging with Firebase, and introduced many improvements. Here is an FAQ to help you understand how these updates may impact you. If you have a question that's not here, use the Send Feedback link at top right to let Google know.

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Cloud Messaging
Cloud Messaging