From the PaySecure homepage:
PaySecure has been designed as a secure payments gateway to facilitate electronic payments for credit card and direct debit.
It supports merchant acquiring through all major Australian banks eg Westpac, ANZ, NAB, Commonwealth and St George Bank and can process all major credit cards including VISA, MasterCard, American Express and Diners Club.
Using military-strength encryption technology, PaySecure ensures tight security – an essential safeguard for online transactions. The service also uses a fault-tolerant architecture to enable rapid data re-routing in the case of individual equipment failure, while also using duplicate site locations to save data in the event of a major disaster.