A dài jīn quàn (cash voucher) is a redeemable certificate issued by businesses that functions like cash toward purchases, though usually with restrictions—such as minimum spending, expiration dates, or limited use at specific stores. The characters break down literally: dài (to substitute), jīn (money), and quàn (voucher or coupon)—so together it means 'a voucher that substitutes for money.' It’s commonly distributed as promotional incentives, customer rewards, or compensation for service issues.

Unlike general coupons (yōu huì quàn) that offer percentage or fixed discounts, a cash voucher has direct monetary value—e.g., ¥50 off your total bill—and is often printed on paper or sent digitally. You’ll encounter it in supermarkets, restaurants, e-commerce platforms, and delivery apps. While convenient, users should check fine print: many vouchers can’t be combined with other offers or exchanged for actual cash.