<ul><li>American Express processes trillions of dollars in transactions annually, requiring low-latency responses.</li><li>In 2018, AMEX revamped its payment system to modernize and ensure scalability.</li><li>The move aimed for cloud readiness, flexibility, security, and low-latency processing.</li><li>Their new system supports larger transaction volumes and faster transaction approvals.</li><li>The Global Transaction Router (GTR) interacts with acquirers, processors, and issuers in the payment network.</li><li>Challenges included managing long-lived TCP sessions, ISO 8583 messages, traffic spikes, and ensuring low latency.</li><li>Design decisions like language choice (Go), gRPC, and asynchronous logging were crucial for optimization.</li><li>Operational best practices include continuous performance testing, chaos testing, and iterative development.</li><li>AMEX's strategic technical decisions have helped create a high-scalable, low-latency payment system.</li><li>Optimization strategies like profiling, reader-writer mutexes, and direct socket writes enhance transaction processing speed.</li></ul>

How AMEX Processes Millions of Daily Transactions With Millisecond Latency

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