This book delves into the essential concepts and technologies of acquiring systems. It fills the gap left by manuals and standards and provides practical knowledge and insight that allow engineers to navigate systems as well as the massive tomes containing standards and manuals. Dedicated to card acquiring exclusively, the book covers: * * Payment cards and protocols * * EMV contact chip and contactless transactions * * Disputes, arbitration, and compliance * * Data security standards in the payment card industry * * Validation algorithms * * Code tables * * Basic cryptography * * Pin block formats and algorithms When necessary the book discusses issuer-side features or standards insomuch as they are required for the sake of completeness. For example, protocols such as EMV 3-D Secure are not covered to the last exhaustive detail. Instead, this book provides an overview, justification, and logic behind each message of the protocol and leaves the task of listing all fields and their