There are various reasons for wanting to update the payment method in eBay. We do not have control of the payment method, but you can find this information inside of eBay by following the steps below:
1. Sign in to eBay
2. Click on "My eBay"
3. This should take you to the "Account" tab
4. Click the drop box to the right of "Account ID" (see Screenshot for details)
5. Click the Option that says "Outright"
6. Now scroll to the bottom where it says "Payment Method"
7. Click the Change Automatic payment method and make sure it is current.
If you you are still having problems with being locked out of your account. Contact support at firstname.lastname@example.org