When you open the app again the ticket verification banner will now appear on the home screen. You can tap the camera icon and complete the process (or submit an explanation for why you don’t have your stub).
The verification banner will persist until you complete the process. You will not be able to navigate through or use the app in any way until you either submit a picture or provide an explanation as to why you don’t have your ticket stub.
You can submit a picture of your ticket stub any time before your next check-in.