redeem a coupon — to exchange a coupon for money, goods, or services

a smiling customer hands a colorful discount coupon to a friendly cashier across the counter. The cashier takes the coupon and examines it while reaching for the cash register. The customer's grocery bill visibly decreases on the register display as the coupon value gets applied. The cashier then hands back change and a receipt showing the savings. Other customers wait in line behind, watching the successful transaction complete. exchanging a coupon for money, goods, or services