If a membership was purchased online we have captured the customer's credit card information and saved it in your Stripe account. If you view the membership in Punchpass you'll see the card that was used. There's an option to change the card if the customer requests to, as well as a direct link to the subscription in your Stripe account if you need to troubleshoot any payment issues.
Your customers with recurring memberships can update their own credit card information as well. Customers who are logged into Punchpass can do it right from their account.
You can also send customers a special link they can use to update the credit card used to pay for their membership.