The Architecture of Financial Truth - Designing a Fault Tolerant System

Building a payment system is an exercise in defensive programming. You must assume the network will fail, the database will lag, and the user will mash the "Submit" button. By mastering idempotency, rigorous ledgering, and asynchronous reconciliation, you build a system that is not just fast, but mathematically certain. As we dive into Chapter 11, remember the golden rule of financial engineering: In God we trust; everyone else must bring their idempotency keys.
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