My clients are required to put a valid credit card number on file when they book appointments online. Then after the appointment, I charge their card through Square. My question is this: Since they must re-enter a credit card number every time they book an appointment, sometimes the same client may choose to use a different card than they used when booking their last appointment. When I go to charge the card on file, there are two. How do I know which card is the most recent card they entered? I want to make sure I am charging the right one.
