Payment rails are the infrastructure that moves money between banks, merchants, and people. They're the systems running behind every transaction—whether you're sending a wire transfer, paying with a card, or moving money through an app. Understanding which rail a payment uses matters because it determines how long the money takes to arrive, what it costs, and what happens if something goes wrong. Different rails handle different types of payments, and they operate under different rules.
These articles explain how each major payment system works: the mechanics of ACH transfers, how card networks route transactions, what happens during a wire transfer, and why some payments settle when ready while others take days. You'll learn what actually occurs when money moves through these networks, not just what you see on your screen.