Why don't I see badges on my app when I use AWS pinpoint to send messages?

I have rawContent message with custom variables message: Attributes.Badge is 4

My rawContent JSON message after create campage:

{ "APSNMessage": { "aps": { "alert": { "title": "Hello", "body": "World!" }, "badge": "{{Attributes.Badge}}", "sound": "default", "content-available": 1 } }, "GCMMessage": { "notification": { "title": "Hello", "body": "World!", "badge": "{{Attributes.Badge}}" } } }

Could you please let me know after the message was sent to my iOS device what the value of the badge field is? It could be 4, "4" or "{{Attributes.Badge}}". Also, does the system field like badge change when using message variables? Thank you.