My iPad won’t let me change the credit card number. I need
my iPad says I need to update payment method but won’t let me edit credit card number
iPad mini 4, iPadOS 14
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First, be aware that you cannot have less than one registered payment card - and that there are restrictions on making changes when there is only one registered card. It is often simplest and easiest to add details of a second payment method, then delete the original if it is incorrect.
More information about payment methods can be found here.
Change, add or remove Apple ID payment methods – Apple Support
Payment methods that you can use with your Apple ID - Apple Support