Amazon.com gift cards can be applied to almost any qualifying purchase in the store, even if that gift card was obtained via exchanging an MP3 gift for credit. Gift cards cannot be exchanged for cash or refunded to your credit card. Promotional codes and gift cards are not the same thing, though both need to be added to your account.
MP3 Exchanges
When you receive an MP3 gift, you will be able to exchange that gift for an Amazon.com gift card for the amount paid for the gift. If the gift did not cost anything, because the MP3 was free or purchased using a promotional code that covered the cost of the purchase, you will not have the option to exchange the gift. Within seven days you will receive your gift card code, which can then be added to your account the same as any other Amazon.com gift card.
Gift Cards
Gift cards can be used for any purchase on Amazon.com, unless otherwise stated on the item in question. It cannot be used on sister sites such as Amazon.uk and Amazon.ca. Gift cards also cannot be used to subscribe to Amazon Prime, or to purchase more gift cards. Before using a gift card on Amazon.com, you must first add it to your account. Once added to your account, the balance of the gift card will be applied to your next purchase. If your next purchase exceeds the balance of the card, you'll need to cover the remaining balanced of the purchase.
Promotional Codes
Occasionally Amazon.com sends out promotional codes for items on their website, and this can include promotion codes for MP3 purchases. These promotional codes can only be used toward the items indicated; if you have a promotional code for an MP3 purchase, then it must be used to purchase MP3s on Amazon.com. Promotional codes must be added to your account like a gift card code, and applies automatically to qualifying purchases.
Applying Gift Card
Log in to Amazon.com. On your account page scroll down to the "Payment" section and select "Apply a Gift Card to Your Account." You may be prompted to log in again for the sake of security. Fill in the claim code for your gift card; this should have been present in the email you received, and will be behind a film on the back of a physical gift card. Click "Apply to Your Account" to add the balance to your Amazon.com account.
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