A system for identifying and associating merchant attributes data of a merchant with transaction data may be integrated with existing payment processing systems to provide for detailed merchant attributes data (e.g., merchant name, merchant ownership data, and merchant address data). The system may receive and modify merchant attributes data retrieved from an external source (e.g., an acquirer computer or third party to a transaction) and store the merchant attributes data in a database. The merchant attributes data may be retrieved and correlated with transaction data and provided to entities (e.g., issuer computers) involved with the transaction for authorization decisioning, fraud analysis, and data analytics.