In the Corporate portal, you open the wizard under Issuing & Payments via Add Configuration and choose Card on File as the payment source.
Card on File is our term for centrally stored cards. This can be a regular credit card, but also a so-called lodged card, central billing account or business travel account where one card number is reused for bookings.
With Card on File you store the card directly: card number, expiry, CVV and cardholder, saved via Store Card. Supported cards are American Express, UATP, Mastercard and Visa. The card is stored securely in tokenized form.