The QcCart software has the capability to let you setup coupons that can be based on a dollar amount or a percentage discount on an individual product or on the quantity of a product. These coupons can be used as a gift certificate and can be redeemed by an unlimited number of your customers or their friends. There is also the capacity to setup discounts for each individual product that are automatically applied, based on dollar or percentage discounts and the quantity or dollar value ordered.