6.2. Payment Methods
What happens when you go to your favorite brick-and-mortar bookstore GreatBooks and use your credit card to pay for the books you want to buy? We illustrate the process with the help of Fig. 6.1. Suppose you want to use your Visa credit card issued by MyCityBank (the issuer bank). You go to the register, remove your plastic credit card from your leather wallet, and give it to the cashier. She swipes the card through the card reader at the POS (Point-of-Sale) terminal and enters the amount of the transaction (say $52.00) and hits ENTER. This starts an authorization request which is sent to the Card Processing Center. The authorization request includes the issuer bank ID, the credit card number, and the transaction amount. ...
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