A coupon for a first purchase only, or for one customer group

The customer asks: A coupon only a new customer may use, or only customers of one group

• Verdict: Ready, with limits (6)
• Door: Check before payment · area: Till controls and approvals › Payment
• Recipe: A coupon for a first purchase only, or for one customer group (coupon rules)
• Sample: S32 — Coupon rules (a check before payment that refuses a coupon the shop restricted)
• Checked: 2026-10-18 · bench

What you build

Your service answers the check before payment. The shop keeps one rule per coupon; the service refuses the coupon when the sale's customer has bought before (a first-purchase coupon) or is not in the coupon's customer group.

Limits

• Answered when the cashier presses Pay, not when the coupon is entered.
• Offline, the till does not ask the service: the coupon applies and the sale is flagged when it syncs.
• The check does not run on a park to a till, a layaway deposit, an account collection or the Desk's own POS screen: a restricted coupon there is neither refused nor flagged.
• The count is taken at the check: a sale for the same customer booked after the check and before the money is not seen.
• A customer group matches exactly: a group under it is not the same group.
• The app's user needs a plain read on the shop's sales and no User Permissions, or a returning customer can pass as new.

Tell the customer

A restricted coupon is refused at Pay with the reason; the cashier removes it and the sale goes on.

What next

1. Tell the customer the 6 limits above, and write them into the proposal.
2. Follow the recipe: A coupon for a first purchase only, or for one customer group (coupon rules).
3. Copy the sample: S32 — Coupon rules (a check before payment that refuses a coupon the shop restricted), and change it.
4. Build and test it on your sandbox (request one if you have none; what is on it).
5. Run the checks: your own tests, the kit's checks and the money kit's release gate (testing and release).
6. Release through the customer's own release gate (14. Testing and release); an app other shops install goes through the App library.

Test it with your service stopped: the till applies the answer you declared for when it is down.

Related needs

• A coupon or a loyalty points balance pays no more than part of the sale — Ready, with limits (1)
• Insurance co-payment: the insurer pays part of a prescription and the customer the rest — Not yet
• No store credit for a walk-in customer, no on-account for a cash customer, and methods that may not be combined — Ready, with limits (2)
• A partner's voucher or PIN made when the sale is paid and printed on the receipt — Not yet

Start a project shortlist with this need · Put it in your blueprint · Every need

This card in the kit