If you scanning a customer’s credit card and the scanner tell you to confiscate the credit card, you should call the card issuer immediately. Because its probably stolen card. You take it and bring it to the store manager. But first you should find out exactly how many times a card can be scanned before it will request it be taken (the store manager should know the details). That way you’ll be able to warn customers if they scan it again you’ll have to take it.