Please, you must understand that this and the "merging a dummy account" method are unbelievably roundabout ways to remove a customer's payment information. Replacing with a nonfunctional credit card doesn't even work for the folks in this thread. When I try it (on multiple customer accounts) QBO just spits back an error that the card isn't valid.

Deleting a customer's card information should be a basic feature and really needs to be added as quickly as possible.

Please!