In fact, the landlord does not know that according to the regulations, the signature strip on the back of the credit card must be signed before it can be used normally. The requirement for signature in domestic credit card use is not very strict, mainly depending on whether the password is correct.

Credit cards must be signed before they can be used, whether you choose a password or a signature;

Verify Only Passwords are valid only in Chinese mainland.

If you apply for a dual-currency international credit card and use VISA, MASTERCARD, JCB and other credit cards abroad, they are all signed by default, and all passwords have no effect. So the signature is necessary, otherwise it will be considered invalid;