Patent ID: 8036967

Claim:
A bank card fraud detection and/or prevention method comprising: a. identifying, using a computer, a test site comprising a first merchant associated with bank card transaction frequencies which exceed a predetermined threshold value indicative of potentially fraudulent bank card activity, said predetermined threshold value a percentage of all bank card transactions over a predetermined time interval; b. identifying, using the computer, a first plurality of bank cards used at said first merchant associated with said transaction frequencies which exceed said threshold value; c. from said first plurality of bank cards used at said first merchant, identifying, using the computer, a second plurality of bank cards which have reversals of charges made at said first merchant before said charges get to posting files such that said charges do not appear on cardholder statements, said reversals of said charges as made such that said charges do not appear on said cardholder statements indicating at least some of said second plurality of bank cards are fraudulent and were being tested at said first merchant to determine if said second plurality of bank cards worked; and d. from said second plurality of bank cards, determining, using the computer, a common point of compromise, wherein said common point of compromise is a second merchant at which at least some of said second plurality of bank cards were used.