Preference of internet-based debit payment protocols

Debit payment is a low cost and low risk payment method in comparison with credit and pre-paid payment methods. In this study, we analyze the structures of Internet-based debit payment protocols and classified them into three types depending upon which party drives the authentication: Payment Gateway, customer's bank, or electronic merchant. For each type, real world protocols, SSL/D, SDT, and SET/D, respectively are exemplified. To compare the merchants' preference regarding these protocols, we have identified five distinctive factors that distinguish the characteristics of these three protocols: authentication method, risk of leaking bank account information, efficient recovery of failed authorization response, merchant's required implementation effort, and customer's ease of use. For these factors, the preferred features of each merchant are mapped to compute the preferences of the protocols.