Finally, we??™ll integrate the API with the TShirtShop e-commerce application and orderprocessing
pipeline.
Credit Card Transaction Fundamentals
For transactions, banks and other financial institutions use secure networks based on the X.25
protocol rather than Transmission Control Protocol/Internet Protocol (TCP/IP), the primary
means by which data is transmitted across the Internet. You don??™t need to know much about
X.25 apart from the fact that it??™s a different networking protocol that isn??™t compatible with
TCP/IP. As such, X.25 networks are completely separate from the Internet, and although it??™s
possible to get direct access to them, this isn??™t likely to be a reasonable option. To do so, we
might have to enter into some serious negotiation with the owners of the network we want
to use. The owners will want to be completely sure that we are reliable customers who are
capable of enforcing the necessary safeguards to prevent an attack on their system. Accordingly,
the network owner won??™t be handing out these licenses to just anyone??”most people
can??™t afford the security measures required (which include locking your servers in a cage,
sending daily backup tapes down a secure chute, having three individuals with separate keys
to access these tapes, and so on).
The alternative is to access these networks via a gateway provider.
Pages:
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737