Gift cards for Amazon.com can be redeemd by scratching off the coating on the back of the card and revealing a 16-digit code, as explained on the company website. After logging in to your account, select the Apply a Gift Card to Your Account option, and enter the code.
WalMart gift cards can be utilized as payment by handing the card to the cashier or during the checkout process online, according to WalMart. They are also accepted at Sam's Club stores and the associated website. American Express gift cards can be used wherever American Express cards are accepted as payment, as noted on the American Express website.
When using a gift card, the original expiration date applies to any remaining balance, explains Amazon.com.