1. Open the customer's profile and, on the User Cards card, click Add Card.
2. A modal opens with a Stripe card form (Card Number, Expiry Date, CVC) — fill it in and click Add Card to submit; the card number is tokenized through Stripe.js directly in the browser and never touches the server.
3. To remove a saved card, click the trash icon on that card.

If more than one of your Stripe accounts (across your kitchen locations) has a live secret key configured, the card list splits into a separate tab per account.