1, overseas credit cards do not need to enter a password, so the signature is very important, and regular merchants will strictly check the signature. 2. The signature of domestic residents spending abroad must be consistent with the signature left by your credit card in case there is any problem. Remind you to use your credit card abroad again, and remember not to leave your sight. There are many clone cards abroad, especially in Southeast Asia. In order to ensure the safety of your funds, try to replace them after returning home.