How do I change credit card information on my Iphone 11

Not sure what you’re asking...

Maybe? Change, add, or remove Apple ID payment methods - Apple Support

Or maybe? To change the virtual number on an Apple Card, select the Apple Card in Wallet, select the ellipsis ..., then select Card Info, and then select Request New Card Number.

So what happens when you add the new credit card to the account, as described here: Change, add, or remove Apple ID payment methods - Apple Support ?

Apple Card is one of many credit and debit and other cards that can be stored in Wallet: How to use Wallet on your iPhone, iPod touch, and Apple Watch - Apple Support

If you do not have the card and do have a payment upcoming, you’re left to work with your financial provider to allow the charge to be accepted, and/or with Apple to sort this pay,enr. Nobody here can help with any of that, unfortunately.

Where do they say that? Can you post a link? Was this very recent?

If you have no credit card to change to and your payment date is imminent then you need to talk to Apple, no one here can fix your problem.

I just called and they didn’t say they were pausing all responses.

Easiest way is to call AppleCare. But be prepared for a wait.

Call AppleCare. Be patient when you do, you may have to wait. 1-800-MYAPPLE