Fintech on Tuan Hiep TRAN — System Design & AI Infra

Fintech on Tuan Hiep TRAN — System Design & AI Infrahttps://tuanhiep.github.io/tags/fintech/Recent content in Fintech on Tuan Hiep TRAN — System Design & AI InfraHugoen-usFri, 03 Apr 2026 00:00:00 +0000Global Payment Gateway (1/4): The Idempotent Payment APIhttps://tuanhiep.github.io/posts/series_2/1.global_payment_gateway_idempotency/Fri, 03 Apr 2026 00:00:00 +0000https://tuanhiep.github.io/posts/series_2/1.global_payment_gateway_idempotency/Exactly-once delivery is an illusion in distributed networks. In this post, we architect an Idempotent Payment API to guarantee financial correctness amidst network timeouts, race conditions, and retry storms.