The signature on the back of a credit card needs to be signed, not for convenience. Most credit cards don't have a password when they spend. In other words, when you go to check out, give the card to the salesperson and swipe it on the POS machine, and the money will be deducted. In the meantime, you don't need to enter a password. At this time, signing a contract is even more important. When you sign and write on the POS document, the responsible salesperson will check whether the signature notes on the document are consistent with the signature on the back of the credit card.

If the credit card is stolen after it is lost, the landlord can apply for refusal. At this time, the bank will check the signature on the POS slip and the signature left in the signature column of the credit card application form. If it is obviously inconsistent, then the application for refusal can be successful.

In order to prevent the refusal of payment after the credit card is stolen, please sign the label after you get the credit card. Note that the signature should be consistent with the signature you fill in the credit card application form, and the signature should not be too block letters, because it is easy to be imitated.

As for debit cards that cannot be overdrawn, it doesn't matter if the signature is empty. Because that kind of credit card consumption needs to verify the password.