There are different amounts you can add to your account: US$10, US$25, US$50, US$100, and a custom amount. You’ll see the bonus listed next to each amount
- Open the App Store.
- Tap on your profile in the upper right.
- Tap Add Funds to Apple ID.
- Open the Mac App Store.
- Click on your name in the bottom left.
- Click View Information at the top.
- Click Add Funds to Apple ID.