Credit card swiping must sign one slip for them to keep, while the other slip is for you to keep. If they leave both slips or they give you one slip, and they leave two slips, it proves that something is wrong. You should ask them at that time or check the history of credit cards. If there is any problem, single out the history and ask them for a claim. If they don't give you a slip, they may have overpaid, because they have to pay for swiping. They didn't dare to let you find out, so they didn't give it to you! Only give you a small ticket! I won't give you a credit card bill! Therefore, in this case, you must enter the password, and you should be optimistic about how much you have to pay before entering the password. The safest thing is to open the credit card SMS notification function, which I like very much. I know all about the changes of funds anytime and anywhere, even if it is 1 cents! The text message arrived at the moment of swiping the card. It is clear that they are not afraid of charging fees!