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Why is the Korean credit card pin a two-digit number?

Because that is the password identification code of the pin code.

The credit card pin code is a password identification code that protects the credit card. This code is similar to the password of the credit card. It can be said to be a code used to improve the security of the credit card.

If the user does not set a credit card password, he can enter the last four digits of the credit card signature. This CVV2 is also a type of pin code. If the user sets a credit card password, the pin code is the credit card password.