How do I charge to a customer’s card on file in Admin and POS?

How do I charge to a customer’s card on file in Admin and POS?

Admin

1. On the checkout screen, scroll to the payment method section. Look for the "Card on File" option. 
2. If you do not see the option, then that customer does not have a card on file.
3. Select the Card on File option by clicking on the radio button.
4. Then make sure to select the card to use. (Even if there is only one card you must choose that card by clicking on the radio button)

POS

1. Go to the Checkout page
2. If the customer has a card on file, you will see a button that says "on file" on the lower right-hand side of the page
3. Click the "on file" button, you will see a popup showing all of the customer's cards on file (whether it is one card or multiple cards)
4. Select the appropriate card and touch submit
5. Enter the pin and follow the normal checkout process