I've tried four different stores and tried using the barcode in the notification as well as from the app directly. None of them ever scan. Is it perhaps my screen? I'm on a Moto X Pure Edition.
Does the code seem to be in focus when you try to scan? Can you add the membership number manually?
I haven't tried it at any self checkouts. The employees aim the gun at it.Are you having an employee use a gun to scan your phone? I keep trying to use the self check out and scanning my phone by pointing it down on the scanner like you would any other item you're buying.