These are the real screens — designing the card, scanning it, and messaging the people who hold it.
Colours, logo, how many stamps earn the reward — set them on one side and watch the card change on the other. What you see is exactly what your customer gets.
Run a different design over Christmas, then switch back in January.
The customer opens their card, you scan the QR with your phone. One tap adds the stamp, and when the card is full the same screen redeems the reward.
How often each customer comes in, what they've redeemed, what they've spent with you over time. Export the whole thing to a spreadsheet whenever you want it.
Some send themselves — a welcome when someone joins, a nudge when their reward is ready, a birthday, a win-back after 30 quiet days. Others you write on the spot: "20% off pastries today, until 2pm." It lands on the lock screen of everyone holding your card, and costs nothing to send.
You're at 9 of 10 stamps at Café Kongens.
Apple Wallet and Google Wallet surface the card on their own when someone comes within about 100 metres of your shop. You don't configure it and they don't opt in — it's built into the wallet apps.