Update
I was doing an up date on all personal information and lost it I was abut to enter credit card information.
iPhone XR, iOS 14
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If you're having problems about payment info, see this support article:--> Change, add, or remove Apple ID payment methods - Apple Support
If the issue persists, contact iTunes Store support team using this link:--> iTunes Store & App Store – Get support for various issues
choosing: your country, then Apple ID, then iTunes & App Store. If your problem is not among the options shown there, tap/click on the option “the topic is not listed” and describe your issue.
Regards
Giulio