How to pay with new credit card for ICloud payment
How to pay ICloud with credit card
iPhone 5s, iOS 12
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Add a payment method — Tap Add Payment Method. Update a payment method — Tap the payment method, then edit your information. You might need to enter the security code that's printed on your credit or debit card. If you use the card with Apple Pay, go to the Wallet app to edit the card information.
Change, add, or remove Apple ID payment methods - Apple Support