A technique for tracking conversion of an online offer includes tracking online and/or offline transactions. A customer accepts an offer provided by a merchant and submits his or her account information so that he or she may receive a reward for satisfying criteria associated with the offer. Transactions of the merchant are then monitored at the payment processor level to determine whether the customer satisfies the purchase criteria. Therefore, online and offline conversion can both be tracked. Further, the merchant is able to determine the overall effectiveness of advertising campaigns by analyzing the number of offers that are both accepted and satisfied.