How to add credit to my account
How do I add credit to my apple account
iPhone 6, iOS 12
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You can transfer funds following the directions in this support article:
Add money to your Apple Account balance - Apple Support
You can also redeem Apple Gift card funds to the account.
How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support
Lastly, you can add a debit and/or credit card to your Apple ID account.
Add a payment method to your Apple ID - Apple Support