just trying to change credit card number.
How do I change credit card numbers to pay for I-cloud
iPhone 11 Pro, iOS 15
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See -> Related Article -> Change, add, or remove Apple ID payment methods
See also -> If you can't remove a payment method from your Apple ID
If you can't remove a payment method from your Apple ID - Apple Support
You can also use your Apple ID balance as payment method:
Add money to your Apple ID balance
Add money to your Apple ID balance – Apple Support (UK)