There are several situations. First, the POS machine is relatively old, so I entered the password, and some buttons were not pressed. You thought they pressed it, so the password was wrong. Second, there is an error in reading the magnetic stripe by the POS machine, and there is an error in the credit card information. You entered the correct password incorrectly. Third, if you use a credit card to withdraw cash, the general consumption password and withdrawal password are two different passwords (unless you change them, the original two passwords are different). )