This is cool, but a part of me has to be flip, and humanity is kind of hilarious to me. All of this amazing infrastructure and hard work to essentially just very carefully and accurately subtract one number from another in a way that makes auditing easy.
I’m surprised a network so sensitive to latency (as are payment networks), was able to achieve their latency SLAs with micro services.
Maybe Amex being a closed-loop network helps with latency?
Hmmm.