Visit American Express Page and login to your account Make sure the balance of the American Express Gift Card is more than the entire cost of the purchase, including taxes. See your Cardholder Agreement for more information. Select ‘Credit’ or ‘Debit’ as the payment method (Do not select ‘Gift Card’) In the Payment Method section, enter the card information as you would a credit or debit card In the Billing Address section, please fill in your name and address Please note: some transaction types require a hold of up to 20% above the purchase amount.