Digital Stamp Cards and Punch Cards: How They Work

2026-09-19 · By Sakib Abbas · 4 min read

How digital stamp cards work, how many stamps to use, choosing a reward that protects your margin, fraud controls, and improving completion rates.

A digital stamp card works exactly like the paper punch card it replaces: a customer collects a stamp per visit and earns a reward when the card is full. The difference is that it lives on their phone, it cannot be lost, and every stamp comes from a signed-in member of staff rather than a rubber stamp anyone can buy.

How a stamp is issued

Staff scan the QR code on the customer's wallet pass. The stamp lands immediately and the pass updates on the customer's phone by itself. One stamp per customer per day by default, which is the control that stops a single visit being stamped repeatedly.

How many stamps should a card have?

Between 4 and 20 is supported; most independents land between 6 and 10. The test is simple: a typical regular should be able to finish a card within about a month. If it takes six months, they will forget about it. If it takes two visits, you are giving away margin you did not need to.

Choosing a reward that protects your margin

Reward the thing with the best margin, not the most expensive thing on the menu. A free coffee costs a café pence; a free main course costs a restaurant real money. Where the headline item is expensive, an amount off works better than a freebie — the customer still buys, and your cost is fixed and predictable.

A milestone part-way through is usually worth more than a bigger reward at the end. Someone sitting on three stamps out of ten has nothing to chase this week; a small reward at four gives them a reason to come back now.

Fraud controls

• Stamps come from a signed-in staff account, not from a stamp anyone can copy.
• One stamp per customer per day by default.
• Deliberate overrides are recorded against the visit, so they can be reviewed.
• Rewards are handed over by a person, so a redeemed card cannot quietly redeem twice.

Improving completion rates

• Ask every customer at the counter — take-up is a staff habit, not a software feature.
• Put the QR code where people already wait, not on a wall behind them.
• Use a milestone so the first reward arrives early.
• Send a free wallet push when someone is one or two stamps away.
• Keep the rules short and visible so nobody argues at the till.

Limitations

• Stamps treat every visit as equal — if spend varies a lot, points may suit you better.
• A card that is too long quietly kills interest.
• Staff still need to ask; a card nobody is offered does nothing.

Best for

• Businesses where a visit is roughly the same value each time — coffee, lunch, a cut, a blow-dry.
• Replacing a paper punch card that gets lost or forged.
• Owners who want the scheme to be obvious to explain at the counter.

Not suitable if

• Spend varies hugely between visits — points per pound is fairer and you can choose that instead.
• Your margin cannot absorb a free item at any sensible card length.
• Customers visit a few times a year; the card will never fill.
• You need spend tracked automatically by the till rather than a scan.

Setup checklist

• Work out the true cost of the reward to you.
• Set the card length so a regular finishes within about a month.
• Add a milestone at roughly half way.
• Decide the rules — one stamp per visit, expiry if any — and keep them short.
• Print the QR code for the counter.
• Do a practice scan and a practice redemption before going live.

A worked cost example

Assumptions, stated plainly. An 8-stamp card giving a free coffee that costs you 40p in beans and milk means your reward cost is 40p per eight visits — about 5p a visit. Against a £3.20 coffee that is a small share of margin. Run the same sum on a free main course at £9 and the picture changes completely, which is why an amount off usually beats a freebie once the item is expensive.

Common questions

Can I use points instead of stamps?

Yes. A card can count stamps per visit or points per pound spent — you choose when you design it. Points suit businesses where spend varies a lot between visits.

What if a customer forgets their phone?

Staff can find them by email and stamp the card anyway.

Can I change the card length later?

Yes, and the change reaches every card at once with nothing to reprint.

Design your digital stamp card — pick the length, the reward and the milestone, and see the real wallet pass before you start.