This article will show you how to redeem the codes on your iTunes gift cards, Apple Music cards or download code through the app store on Mac OS.1. Open the App Store. 2. Click on your Apple ID at the bottom left corner of the App Store Window. If you are not logged in, click on Sign In in the same location. 3. On the Account page, click on Redeem Gift Card. 4. Enter the code to redeem your card or download. If your code has a box around it, you may also click on the Use Camera here for the built-in camera to quickly scan it to redeem the code.Once you have the code, click on Redeem and it will be applied to your Apple account.