korttienumero

Korttienumero, also known as a card number, is a unique identifier assigned to a payment card, such as a credit card or debit card. It is typically a 16-digit number that is printed on the front of the card. The korttienumero serves several purposes in the financial system. Firstly, it is used to authenticate the cardholder when making a transaction. Secondly, it helps in tracking and managing the card's transactions. Thirdly, it is used to prevent fraud by ensuring that the card is genuine and has not been reported as lost or stolen.

The korttienumero is not the same as the card's security code, which is a three-digit number printed on the back of the card. The security code is used to verify the cardholder's identity during online transactions. The korttienumero is also different from the card's expiration date, which indicates the month and year when the card will no longer be valid.

The korttienumero is issued by the card-issuing bank and is linked to the cardholder's account. It is important to keep the korttienumero confidential and not share it with anyone, as it can be used to make unauthorized transactions. If a card is lost or stolen, the korttienumero should be reported to the card-issuing bank immediately to prevent fraudulent use.