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There are seven numbers on the back of the credit card, four in the front and three in the back. What's the use?
There are seven digits in the signature column on the back and right of the card.

They are: xxxxxxxx.

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The first four digits are the last four digits of the card number.

The last three digits are the CVV2 check code, and the so-called last three digits are generated by the coding rules and encryption algorithm of the issuing bank.

If someone knows the card number, card expiration date, password and CVV2 code, then you can directly use your card to spend online. Be careful to protect it.