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The CVV code on a credit card is the three digit number on the back of a credit card. It is an extra security measure that ensures that the person paying with the card is the one physically with the card.
This is a three or four code printed on the card to help prevent against fraud. the designers created something called a Dynamic CVV. This CVV changes which each read of the card. From all of this take virtual credit card or debit card. Which is a most secure for online transactions. Hence you no need to submit any details.
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Card Verification Value.
credit card numbers are the 16 digit numbers on the front of the card and the expiration date is when the card expires.