Card on File shows you merchants where your debit card is stored. You can use this to confirm if you have legitimately added the card with the listed merchants and to reduce your financial exposure. Please note that your card will only show as being on file after you have stored it with a merchant and made at least one purchase. You are also able to view merchants with whom you have set up Recurring transactions. This gives you an opportunity to decide if you really need to subscribe to so many services!