A method and system for processing a merchant identification request from a private label payment card issuer is provided. The issuer is communicatively coupled to a multi-party payment card interchange that includes access to a database. The database stores a plurality of historical multi-party payment card transactions. The method includes transmitting a list of private label merchant locations from the issuer to the interchange wherein the list includes physical location information relating to the private label merchants listed, processing the list at the interchange by applying thereto an identification analysis including one of merchant matching only, test transaction only, and merchant matching plus test transaction, identifying at least one private label merchant location included within the list including associating a unique identifier with the at least one identified private label merchant location, and outputting the at least one identified private label merchant location with the associated unique identifier.