Freestyler,
with Visa CC : in the back of the cc there is last three digit number, some store use it as validation. Like when you order something from Dell online using visa they will ask your 3 digit number in the back of the card.
Amex: 4 digit number above your CC number is for validation purpose also.
MC: in the back is 6 digit number.
with Visa CC : in the back of the cc there is last three digit number, some store use it as validation. Like when you order something from Dell online using visa they will ask your 3 digit number in the back of the card.
Amex: 4 digit number above your CC number is for validation purpose also.
MC: in the back is 6 digit number.