Doorcount idea sheet · srchambercommerce.com/ideas/stamp-card

A stamp card that ends in something people want

A simple stamp card turns occasional visits into a habit, as long as the reward is worth finishing.

Steps

Pick a reward people actually want, not the item you have too much of.
Keep it short: six to ten stamps. Some shops start each card with one stamp already given.
Use a stamp or punch shape that is hard to copy at home.
Print the rules on the card: one stamp per visit or per purchase, and whether the card expires.

Finished cards each week, and repeat visits on your door count.

First-time customers leave with a card good for something small on a second visit within 30 days.

Customers who drifted away often just forgot; a friendly note with a reason to return brings some back.

Something available only for a few weeks gives regulars a reason to come back before it is gone.