To delete a customer's credit card on file, navigate to the Customers tab.
From the Customers tab, find the customer you want to delete a card on file from. Click on the name of the customer to open the customer's profile.
When you are on the customer's profile, scroll down until you see the "Credit Cards/ACH" section on the right-hand side of the screen.
In the Credit Cards section, you will see the customer's card linked and highlighted in green:
Click the red "Delete Credit Card" button to remove the Customer's Credit Card from their account.