Can I use my American Express Cash Back Rebate check as a form of payment online at costco.com?
American Express Cash Back Rebate checks are not accepted as a form of payment online at costco.com. You may however, use your Cash Back Rebate check to purchase a Costco Cash Card at your local warehouse. This cash card may then be used to pay for an order online at costco.com. Click here for the Terms and Conditions of use for the American Express Cash Back Rebate.