Google Cloud Messaging for Android (GCM) –
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GameSparks and FireBase Cloud Messaging (FCM) on Android : GameSparks
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Firebase Cloud Messaging | Send notifications across platforms for free
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Google Cloud Messaging for Android (GCM) –
Google Cloud Messaging For Android (GCM) Simple Tutorial | fundroiding
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Android Push Notifications
Google Cloud Messaging - Xamarin | Microsoft Docs
