A common point of purchase (CPP) system for identifying a common point of purchases involved in fraudulent or unauthorized payment transactions is provided. The CPP system includes a common point of purchase (CPP) computing device that is configured to receive transaction data and build a table in a database, the table including recording pairing merchant and account identifiers. The CPP computing device is also configured to receive a list of flagged account identifiers and compare the list to the table. The CPP computing device is further configured to compute a metric and build a merchant profile for each merchant, for display at a client system.