Kindly note that your cards are safely stored, so you can reuse the payment method, making the purchasing process easier for you. Nonetheless, if you wish to remove your registered payment method, this option is available for you during the checkout process by clicking on the Delete payment method link.
It matters if you're Plus
If you are subscribed to Plus, you can change your payment method but not delete it; you manage this from your profile's Subscriptions section.
In order to carry out the automatic renewal process it is necessary to have an active payment method.
Remember that you can also cancel your subscription at any time if you choose to.