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What is the use of applying for seven digits at the signature office of CITIC Bank Platinum Credit Card?
The first four digits of these seven digits are the last four digits of your credit card number (hehe, check it), and the last three digits are commonly called' check code'. Different bank cards have different uses for these three digits, but usually these three digits are needed for online payment, so you must protect the three digits and don't show them to others, otherwise you will still have certain risks when using the card.