How to update my payment method?

This link is what you are looking for→If you need to change or update your Apple ID payment method - Apple Support

bidemi1212 Said:

"How to update my payment method?"

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Updating Methods of Payment:

A. Add, then Remove:

Seeing "update", have you changed your credit card number?. If so, add the new card, and then remove this card. You need at least one Method of Payment assigned to your Apple Account. This is because even free apps have the option to purchase items from within.

No success?...

B. For Financial Assistance, Contact Apple Store Support:

You need to contact Apple Support Directly. This is a User-to-User forum. We are all volunteers. So, as you may suspect, no one here has access to that information — and that is a good thing, BTW. That’s why for Financial Assistance, you need to contact Apple Support. They’ll see what’s going on and will run you through the fix.

Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)