https://tuanhiep.github.io/tags/payment-gateway/Recent content in Payment-Gateway on Tuan Hiep TRAN — System Design & AI InfraHugoen-usFri, 24 Apr 2026 00:00:00 +0000https://tuanhiep.github.io/posts/series_2/4.global_payment_gateway_reconciliation/Fri, 24 Apr 2026 00:00:00 +0000https://tuanhiep.github.io/posts/series_2/4.global_payment_gateway_reconciliation/Internal systems do not become correct at the API boundary; they become correct through reconciliation with external truth.https://tuanhiep.github.io/posts/series_2/3.global_payment_gateway_ledger/Sat, 18 Apr 2026 00:00:00 +0000https://tuanhiep.github.io/posts/series_2/3.global_payment_gateway_ledger/Balance is a lie; the journal is the truth. Explore how to architect a high-throughput ledger that preserves financial correctness under extreme concurrency.https://tuanhiep.github.io/posts/series_2/2.global_payment_gateway_sagas/Sat, 11 Apr 2026 00:00:00 +0000https://tuanhiep.github.io/posts/series_2/2.global_payment_gateway_sagas/Why Two-Phase Commit (2PC) fails at scale, and how to architect the Saga Pattern and Transactional Outbox to guarantee data consistency across microservices.https://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.