Answer: The answer is Coupon.
Explanation: A coupon refers to a ticket or document which when used, can be redeemed for a financial discount or rebate when a product is being purchased.
Usually, coupons are issued by manufacturers who produce consumer packaged goods, coupons can also be issued by retailers as well, and they are to be used in retail stores as a part of sales promotions.
An example of a coupon can be seen in the question above, another example of a coupon is a paper that entitles a customer to 10 percent off of a meal in a restaurant.