You must have at least one valid credit card on file as your default payment method. If there’s only one card saved, it can’t be deleted.
Managing Credit Cards
Log in to your Dashboard.
Go to Account, and click Manage Subscription.
Click + Manage Cards.
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From here, you can:
Add a card: Select Add New and enter your card details.
Change the primary card to be charged: Select the card and choose Set this as primary or backup.
Remove a card: Select the card and click Remove Payment Method.