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Credit Card Control Code Help

ENGLISH:

The CVV2 is a 3- or 4-digit value printed on the card or signature strip, but not encoded on the magnetic stripe.

MasterCard and Visa credit cards have a 3-digit code, called the "CVC2" (card validation code) and "CVV2" (card verification value). It is not embossed like the card number, and is always the final group of numbers printed on the back signature panel of the card.

Some new MasterCard and Visa cards feature the "CVC2" in a separate panel to the right of the signature strip.[2] This has been done to prevent overwriting of the numbers by signing the card.  American Express cards have a 4-digit code printed on the front side of the card above the number, referred to as the CID (or Unique Card Code). It is printed flat, not embossed like the card number. The number is generated when the card is issued, by hashing the card number and expiration date under a key known only to the issuing bank. Supplying this code in a transaction is intended to verify that the customer has the card in their possession. Knowledge of the code proves that the customer has seen the card, or has seen a record made by somebody who saw the card. To date, no cracks for this system are known.
 

Hrvatski:

Kontrolni broj je troznamenkasti ili četveroznamenkasti broj otisnut na kreditnoj kartici, koji se ne pohranjuje se na magnetskoj traci kartice niti se pojavljuje na računima i potvrdama kod trgovaca. Kontrolni broj služi kao dokaz da fizički posjedujete karticu u trenutku online kupnje i smanjuje mogućnost zloupotrebe.

Položaj kontrolnog broja ovisi o kreditnoj kartici. Za izabranu kreditnu karticu sa svoje kreditne kartice unesite kontrolni broj u odgovarajuće polje prema sljedećim uputama. Za American Express kreditne kartice izdane u Hrvatskoj koje počinju s brojem '3775' postoji troznamenkasti kontrolni broj (posljednja desna grupa od 3 znamenke) otisnut na poleđini kartice i potrebno je njega upisati, u suprotnom se upisuje četveroznamenkasti broj otisnut na prednjoj strani kartice. Za ostale American Express kartice potrebno je upisati četveroznamenkasti broj otisnut na prednjoj strani kartice. (vidi sliku)
 
Prilikom plaćanja Mastercard ili Visa kreditnim karticama potrebno je upisati troznamenkasti
broj (posljednja desna grupa od 3 znamenke) koji je otisnut na poleđini kartice u potpisnom polju. (vidi sliku)

American Express:



Mastercard, Maestro, Visa: