You can create and manage coupons in the Coupons section of the store dashboard. When creating a coupon, you can choose between offering a percent discount or a dollar amount. You can also choose whether the coupon will apply to the whole order, just to shipping costs, or only to certain products. Items in the store can be marked as coupon ineligible.
Coupons can have a start date and an end date, and you also have the option to limit the number of overall uses and uses per fan.
You can create your own coupon codes or have the system generate unique codes for you. All coupon codes are entered in the cart at checkout.