Keep more than one card, and pick which one gets billed
Every card you have added is listed here. The one marked We bill this one is what your membership renewal and any session fee are charged to. To use a different one, tap Bill this one underneath it — nothing is charged by switching, and your membership moves across with it, so the next renewal uses the card you just picked. To take a card off the account, use Remove or update a card, which opens the same secure Stripe page.