Google makes it even harder, as if you wish to delete a credit card, you have to login into a website version of the part of Google Play which manages them; yet

Google makes it even harder, as if you wish to delete a credit card, you have to login into a website version of the part of Google Play which manages them; yet, you still need to leave at least one cc number there. I deal with this by using a feature my credit provider offers, which allows users to generate and delete virtual valid CCs arbitrarily.