Apple ID

Before you can add funds to your Apple ID, you must have a valid payment method on file. Learn about the payment methods that you can use with your Apple ID. See how to Add funds to your Apple ID https://support.apple.com/en-us/HT208687

You can also buy/redeem iTunes Gift cards to the account.

App Store & iTunes Gift Cards by Email.     

Gift cards redeem.    

Gift Card - can’t redeem.