Get your Xbox USA account card to purchase games, movies, apps and other content from Xbox online store.
1- Sign in to your Xbox console (make sure you’re signed in with the Microsoft account).
2- From the Home screen, select and open the Store app.
3- Press the View button to open the side menu then select redeem.
4- Enter the 25-character code which you received in your inbox from iCards, and then follow the prompts.