| 摘要 |
A network-based sales system includes at least one buyer computer (12) for operation by a user desiring to buy a product, at least one merchant computer (14), and at least one payment computer (16). The buyer computer is programmed to receive a user request for purchasing a product. The payment computer is programmed to receive the payment message, from the buyer computer, to cause an access message to be created that comprises the product identifier and an access message authenticator based on a cryptographic key, and to cause the access message to be sent to the merchant computer. The merchant computer is programmed to receive the access message, to verify the access message authenticator to ensure that the access message authenticator was created using the cryptographic key, and to send the product to the user desiring the product.
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