How to update credit card number
How do I change credit card number for Apple iTunes Purchases?
iPhone 7 Plus, iOS 13
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Log into your account in the App Store/iTunes and you should be able to change/verify it there. Or you can click the blue Edit payment methods in the article below. When signed in and the page loads, you will be on the credit card page. After updating that, click the Go Back button at the lower left and you will be on the address page.