Hello, I'm trying to integrate Push Notification for my game. The doc says I need to provide User ID to App42's server and I've done the step without problem with userId = "testid".
But what value should I use to identify uniqe ID? What I need to do is to notify player's every device. The situation is, the player log in to facebook (API) on iphone, then he register the push notification. Then he login to the same facebook account to iPad and register to push notification too. What User ID should this player use so that he receive push notification on both iPhone and iPad (Android too). Is it allowed to register the same User ID(maybe facebook id or email) with different Device ID (from Apple's/Google's Push Service) so that my own server can send message to one User ID, and the App42 server will send the message to every device?