Hello there, IAMRSherri.

As of now, you can only add a payment method to the transaction and the customer profile.

For the vendor side, I'd suggest sending Feedback to our Developers. Please know that your product suggestion is a great help so we can provide a more friendly user interface.

For now, you can select a different method of payment on the transaction page.

If you want to update your payment method, you can check this reference:  Add or modify the accepted credit card types in QuickBooks.

I'll be around if you need help updating your payment method.