The signature strip on the credit card is specially designed to prevent others from changing the original cardholder's name after stealing the card: it is very thin, and it is easy to break and change color if it is stained with chemicals, and the word "invalid" is displayed at the bottom. Therefore, if the signature is wrong, never use chemicals to change it.

If there is something wrong with the signature, you can cross out the original signature without completely covering it. Just draw a horizontal line and re-sign it next to the signature column. In this case, it's best to shop with your ID card, especially when you spend a lot of money, so as not to ask for identification.