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To provide for secure payment processing over the Internet, the SET specification defines multiple transaction types, as shown in Table 8-1. To illustrate how SET provides security of payment processing within e-commerce transactions, we next discuss each of the following transaction types in depth:
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Purchase request Payment authorization Payment capture
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The purchase request transaction is made up of four messages that are exchanged between the cardholder and the merchant: 1. Initiate request. When the cardholder has selected a purchase and decided which payment card to use, the cardholder is ready to initiate the request. To send SET messages to a merchant, the cardholder must have a copy of the merchant s and payment
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Table 8-1 SET Transaction Types
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Transaction Cardholder registration Merchant registration Purchase request Description
Allows the cardholder to register with a CA. Allows a merchant to register with a CA. Message from the cardholder containing order information (OI) and payment information (PI) and sent to the merchant and bank. Message between the merchant and payment gateway requesting payment authorization for a transaction. Message from the merchant to the payment gateway requesting payment. A CA may send this message to either cardholders or merchants to state that more processing time is needed. or A cardholder or merchant may send this message to a CA to check the current status of a certificate request, or to receive the certificate if the request has been approved. Allows the cardholder to check the status of authorization, capture, or credit processing of an order after the purchase response has been received. Allows a merchant to reverse an authorization entirely or in part. Allows a merchant to correct errors in previous capture requests, such as those caused by human error. Allows a merchant to issue credit to a cardholder s account for various reasons (such as for returned or damaged goods). Allows a merchant to correct errors in a previous credit request. Allows a merchant to request a current copy of the payment gateway s certificates. Message between merchant and payment gateway regarding merchant batches. Indicates that a responder rejects a message because it fails tests of format or content verification.
Payment authorization
Payment capture Certificate inquiry and status
Purchase inquiry
Authorization reversal Capture reversal
Credit
Credit reversal Payment gateway certificate request Batch administration Error message
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gateway s key-exchange keys. The SET order process begins when the cardholder software (software that runs with your browser) requests a copy of the gateway s certificate. The message from the cardholder indicates which payment card brand will be used for the transaction. 2. Initiate response. When the merchant receives an initiate request message, a unique transaction identifier is assigned to the message. The merchant then generates an initiate response message containing its certificates and that of the payment gateway. This information is then digitally signed with the merchant s private key and transmitted to the cardholder. 3. Purchase request. Upon receipt of the initiate response message, the cardholder software verifies the certificates of both the merchant and gateway. Next, the cardholder software creates a dual signature using the OI and PI. Finally, the cardholder software generates a purchase request message containing a dual-signed OI and a dual-signed PI that is digitally enveloped to the payment gateway. The entire purchase request is then sent to the merchant. 4. Purchase response. When the merchant software receives the purchase request message, it verifies the cardholder s certificate contained within the message, as well as the dual-signed OI. The merchant software then begins processing the OI and attempts to gain authorization from the payment gateway by forwarding the PI. Finally, the merchant generates a purchase response message, which states that the merchant received the cardholder s request. Upon receipt of the purchase response from the merchant, the cardholder software verifies the merchant certificate as well as the digital signature of the message contents. At this point, the cardholder software takes some action based on the message, such as displaying a message to the cardholder or updating a database with the status of the order.
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