Gift Cards
I redeemed a gift card and the balance isn't showing up on my account.
iPhone 8 Plus
Question marked as
If you've tried logging out and back into the account : http://www.apple.com/support/itunes/ww (click on your country's flag, the country where you live, and which is therefore the country on the account ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)