Dear Quickblox Users,
We would like to inform you that on April 11, 2019 the GCM server and client APIs will be removed.
We recommend that you migrate your GCM apps to Firebase Cloud Messaging (FCM) that inherits the reliable and scalable GCM infrastructure, plus many new features.
We have added an article in our documentation about the GCM-FCM migration process: https://quickblox.com/developers/How_to_migrate_from_GCM_to_FCM
If you experience any issues, please reach out to our support team by submitting a ticket.