Chat Mobile Push Notification

[luannguyenkhoa]

Thanks for your example.
I'm making an attempt to build a mobile Chat app and prefer AWS AppSync. For chat app, one of the basic requirements is Push Notification when user is not using the app, but I haven't found any tutorial or article that points out how to accomplish a completed AppSync chat app supporting Push Notification.
It will be very much appreciated if any suggestion to guide to get Push Notification (APNS/FCM) worked with AppSync successfully.