How to Create a Coupon Code: 1) Do not give away free product without expressed permission. 2) No discount or sale can ever be more than 20% of the regular sale price. Avoid using 20% off for major sales like Black Friday/After Christmas only. ALWAYS test your coupon codes before making them live! Testing Checklist: Add the item to your cart by itself and click through to checkout. Did the discount get applied? Use the 'promote' link to add the item to your cart. Did the discount get applied? If the item is a discount with minimum purchase, verify that the discount does not apply unless the minimum order is reached.