Могу только на документацию скинуть ссылку (для андроида, думаю в разделе для iOS тоже что-нибудь упомянули)
https://api.playfab.com/docs/push-for-android
Advanced Push for Android
By default, our plugin routes the push notification message to the notification area whether the game is the active app or not. To override this behavior, you will need to be subscribed to the push notification listener and update the plugin with your routing preference.
To subscribe to the event listener call:
PlayFabGoogleCloudMessaging._MessageCallback += OnPushReceived;