Building Payment Processing Systems: Architecture and Engineering Basics

Modern software systems rely on robust, resilient, and secure financial processing infrastructure. This course guides you through the foundational concepts of building and integrating payment systems, from transaction lifecycles to distributed reliability. You will explore how payment gateways, merchant accounts, ledgers, and settlement pipelines interact to execute transactions safely. What you'll learn: Understand core payment terminology including authorization, capture, settlement, and chargebacks. Design reliable payment workflows using idempotency keys and asynchronous message queues. Implement secure handling standards and tokenization practices aligned with data protection requirements. Configure webhooks and event-driven architectures to track real-time transaction states. Manage distributed transaction challenges such as dual-write problems and reconciliation flows. The course starts with essential fintech concepts and transaction models before advancing to robust architectural patterns and written integration exercises. This course is designed for aspiring software engineers, backend developers, and technical professionals with basic programming awareness who want to understand payment engineering. Read through the lessons and start developing dependable payment architectures today.