Try the card
as your customer would.
Create a card for Bar Demo Hash42, save it to Google Wallet and tap "Simulate a stamp": you'll see it fill up in real time.
On a computer?
Scan the QR code with your phone.
2. Want to see the till too?
Open the demo till on a second device, scan your card's QR code and add the stamp just like your staff would.
Open the demo till