Forum Moderators: buckworks
AVS stands for Address Verification Service (UK standard which entails merchants sending numeric portions of address (ie House, Flat number) and postal code to acquirer for onward checking with Issuer
AAV stands for Automated Address Verification (US standard that entails merchants sending first line address (with appropriate truncation ie Street becomes St) and full zip code to aquirer for onward checking with issuer.
In the UK AVS standard the merchant will receive seperate responses to each data element as either matched, unmatched or unchecked. Some Issuers respond "partial match" which is about as useful as "mango" as a response.
CVV and CVV2 standard for Card Verification Value and are used by Visa and MC. Both values are *supposed* to be mandatory as a three digit code debossed on the signature strip on the back of the card.
CID are the Card Identification Digits AmEx uses and, to confuse the issue completely, normally appear as four digits *printed* on the front of the Card but also as three digits debossed on the back of the Card (US at this time).
CVV, CVV2 and CID are excellent protection for e-tailers against card number generator attacks as they are not stored in the mag stripe and are fiendishly difficult to guess!
Hope this helps
Sticky me if you need more
CVV2 + CID, are the same thing, they are the 3 digit numbers on the back of your card(4 digit in case of Amex, in front).
All these three are for fraud control and are used to provide an additional layer of protection to the merchant & cardholder
