Digital Stamp Cards via QR: Replace Paper Punch Cards with Server-Side Loyalty

1. How It Works

Each visit, the customer scans a unique merchant QR. The server increments their stamp count against their phone number or email. At the reward threshold, the server issues a redemption code.

2. Fraud Prevention

A server-side count replaces a physical punch card, which can be forged by scanning the same merchant QR multiple times. Rate-limit stamps per account per day to one.

3. Registration

Keep registration minimal: a phone number or email is enough. A full account sign-up reduces adoption. Ask only for what you need to deliver rewards.

4. Reward Notification

Send an automatic message when the customer earns their reward. A thank-you message after each stamp keeps the programme top of mind.

5. POS Integration

The simplest integration: a unique merchant QR at the counter. The customer scans; the server records. No POS modification is needed.