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An Issuer Solution With Host Authorization

In this example, the ASx solution is once again installed in two locations, connected by dual TCP/IP Wans. ASx could either be configured in load-sharing mode or in primary/secondary mode. The network management will be responsible for routing transaction messages arriving from the networks to the appropriate ASx for processing. There are various ways to achieve this depending upon the mode of operation required. As always, the important point is that one ASx will take the load of another immediately when a failure occurs.

For redundancy, there are twin Visa, MasterCard and domestic interchange access points. Additionally, there are two connections to the host authorization system. ASx will automatically switch to an alternate interface or access point should it detect a failure. Twin hardware security modules (HSM) are connected at each site to provide redundancy and to enhance performance.

HotSync® is used to maintain the integrity of the data used by both ASx systems running at the two locations.

Authorization is normally performed on the connected host system. ASx will perform some basic pre-authorization checks before passing the transaction to the host for final processing. ASx can perform stand-in authorization should the host become unavailable for any reason. The authorization will be conducted against predefined limits, conditions and rules. Following a failure and when the host becomes accessible again to ASx, transactions completed and stored during the offline period will be forwarded to the host.

Not-on-us transactions received from the domestic interface shall be routed to the Visa or MasterCard networks for processing. On-us transactions originating from any network shall be processed directly by ASx.

ASx shall provide the required settlement for the domestic interface. ASx provides Visa Base 2 and MasterCard ECCF/ICF clearing interfaces.