Add or replace your card at Settings → Billing → Payment Method. Changes take effect on the next charge; failed payments retry for 7 days.
Open Settings → Billing → Payment Method, click Update Card, and enter the new details through the secure Stripe form. New card is used for the next invoice; if a charge is currently failing we retry on the new card immediately.
Settings → Billing → Payment Method.
We retry for 7 days, then downgrade to Free. Sites remain intact.