American Express is offering a $5 statement credit to users who spend $5 on the iTunes and App Stores by April 30th. The rebate, part of AMEX's "Offers for You" promotion, requires that users opt-in to the offer on the American Express website, and then spend at least $5 on iTunes by the end of the month.
AMEX cardholders need to ensure that their card is set up as the default billing method within iTunes itself. Once a $5 purchase is made and charged to the American Express card, a $5 statement credit will appear on their account.
Spend a total of $5 or more on iTunes using your enrolled American Express Card by 4/30/14 and get a one-time $5 statement credit.
American Express runs a number of these promotions, though availability does vary based on previous card usage. Some users may not be able to see the iTunes promotion because of how they use their card, for example.