Abstract: Secure transmission of data is provided between a plurality of computer systems over a public communication system, such as the Internet. Secure transmission of data is provided from a customer computer system to a merchant computer system, and for the further secure transmission of payment information regarding a payment instrument from the merchant computer system to a payment gateway computer system. The payment gateway system evaluates the payment information and returns a level of authorization of credit via a secure transmission to the merchant which is communicated to the customer by the merchant. The merchant can then determine whether to accept the payment instrument tendered or deny credit and require another payment instrument. An architecture that provides support for additional message types that are not SET compliant is provided by a preferred embodiment of the invention. A server communicating bidirectionally with a gateway is disclosed.

Abstract: An architecture for verifying the operation of a remote transaction clearance system is disclosed. A merchant-controlled computer communicates with a test gateway computer over a communications channel. The merchant-controlled computer transmits messages representing test transactions to the test gateway computer on the communications channel. The test gateway computer responds with simulated transaction responses. In another aspect of the invention, the transaction responses include configuration data that is used by the merchant-operated computer to configure itself to access a production gateway computer.