Check-in to a participating store, introduce yourself by name, and collect points and stamps for your purchases. No fiddling with QR codes or barcodes, you can even check-in before walking to the store, and never pull your phone out of your pocket at the till.
To start, just sign up using your name, or a nickname. No personal data required! No mobile phone number or email address is necessary to use the app, just your name. Optionally, you can sign in with Facebook, which will allow you retrieve your points and stamps if you change phone.