LESSONS FROM BIG TECH ON BUILDING RESILIENT PAYMENT SYSTEMS

Summary from the TLDR Web Dev newsletter

For resilient payment systems, Big Tech uses idempotency keys to prevent duplicate transactions and sets short timeouts to provide quick feedback to users. Circuit breakers, like in the stock market, are used to prevent cascading failures. These companies monitor the “four golden signals” (latency, traffic, errors, and saturation) to find and fix issues before they affect users.