gift voucher
noun [ C ]
ukus( also gift coupon); ( UK also gift token); ( US gift certificate) COMMERCE, MARKETING
a card or piece of paper that can be exchanged in a store for goods of the value that is printed on it:
You can buy an electronic gift voucher the way you might buy a book or CD.
The prize is a $100 gift token to Border's bookstore.
Full instructions and terms and conditions are included on the gift certificate.