Let me share some information about adding a credit card for bill payments, morris.
Currently, adding a credit card for bill payments in QuickBooks Online (QBO) isn't available. As a workaround, we can follow 4Gal's resolution, or you can check other third-party applications that work well with the program.
Here's how:
Go to the Apps menu.
Choose the Find apps tab.
Select the application that suits your preferences.