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What is the six-digit password in the envelope of ICBC credit card? What's the use?

This password is the password of bank transaction, that is, the password of deposit and withdrawal, which is not compatible with the password of online banking. You need to change this original password as soon as possible. You can use six digits that you are familiar with, but don't use your birthday phone number as the password. For security reasons, it can be modified in ATM machines and business halls, which is very convenient.