Overview

A technical guide for software engineers, architects, and technical leaders building secure payment acceptance systems. This volume covers the complete landscape of modern Point-of-Sale development-from traditional terminals to SmartPOS devices and software-based SoftPOS solutions running on smartphones and tablets. Part I establishes the foundations: the four-party payment ecosystem, EMV transaction principles, digital wallet integration, and the trust architectures that enable secure processing on consumer devices. Part II dives into application architecture: layered design patterns, the POS as a policy enforcement point, transaction lifecycle management, DUKPT key derivation, HSM and PIN block handling, and JWT-based authentication. Part III explores backend systems: ISO 8583 messaging, scheme integration, and the testing and certification workflows required for EMV Level 3 approval. Part IV addresses operations: secure deployment, ongoing PCI compliance, and emerging trends shaping the future of payment acceptance. Whether you're integrating an EMV kernel, designing a SoftPOS SDK, or architecting acquirer backend services, this book provides the technical depth needed to build certifiable, production-ready payment systems.

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