1. A method of processing a merchant identification request from a private label payment card issuer, the private label payment card issuer communicatively coupled to a multi-party payment card interchange that includes access to a data warehouse and a merchant matching tool, the data warehouse for storing a plurality of historical multi-party payment card transactions, said method comprising: transmitting a list of private label merchant locations from the private label payment card issuer to the multi-party payment card interchange, the list including physical location information relating to the private label merchants listed; processing the private label merchant list at the merchant matching tool, the merchant matching tool configured to apply 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 private label merchant 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.