Do you have your customer's card number and wanting to charge the card for them?
Or maybe your customer needs to update their card on file but isn't savvy enough to do it via the payment management screen and instead has given you the card number.
In order to change your customer's credit card number, you want to make sure there is a receipt with a payment due via credit card. This can be done in 3 ways.
Products > Purchases tab > Search for the customer > Locating the purchase via the purchase screen
Lists & Contacts > Contacts tab > Search for the person > Locate the purchased product via their contact screen
Products > Products tab > Locate the purchased product > Purchases tab > Search for the customer > Locate the purchase via the billing screen
Once you have located a purchase with an receipt and with a payment due via credit card...
In the Charges & Payments box
You'll see the 4 digit card number link
Select the 4 digit card number link to edit the card number and click the Enter new card button in the pop-up screen
The new credit card number is now listed as a method of payment.