As far as I know, credit cards can be used without a password, but for security reasons, I think a password can be set for credit cards, which can better ensure the safety in the process of consumption. If the landlord wants to set a password for the credit card, there are three ways:

First, set the credit card password through the bank official website.

Second, set the credit card password through the bank customer service hotline.

Third, set the password through the local bank outlets.

The above is the information I have learned. I hope my answer can help the landlord!