Tag: #payments
Writing on GPUs, LLMs, MLOps, Kubernetes — and mindset · 9 posts
9 posts are tagged #payments; the most recent was published on 2026-07-03.
Often tagged together: #stripe 3 #accounting 2 #adyen 2 #english 2 #finance 2
Most read in the last 90 days:
Payment Systems 101: Flow, PSPs, Card Networks, Settlement
What actually happens when you press the pay button, from an engineer's point of view. The difference between authorization, capture, and settlement; the five players (merchant, PSP/gateway, acquirer, card network, issue
2026-07-03 · 13 min read #payments#fintech#systemsPayment Idempotency: Preventing Double Charges
The network will eventually drop, and when it drops, clients retry. But in payments, a retry can become a double charge. Idempotency keys, dedup windows, unique constraints, the retry-plus-timeout problem, at-least-once
2026-07-02 · 14 min read #payments#idempotency#reliabilityDesigning an Invoicing and Billing System — So the Money Does Not Leak ♪ Listenable
A design-oriented walkthrough of a billing system, from invoice components to billing types, taxes, status flow, data model, payment integration and reconciliation, idempotency, multi-country and multi-currency handling,
2026-07-01 · 20 min read #invoice#billing#system-design#payments#accountingDouble-Entry Ledgers: Designing Systems That Never Lose Money
Why a 600-year-old accounting technique is the beating heart of modern payment systems. Debits equal credits, immutable append-only entries, accounts and balances, the answer to "why not just a balance column?", reconcil
2026-07-01 · 15 min read #payments#ledger#accounting#databasesStablecoins and Regulation — The Rise of the Digital Dollar ♪ Listenable
A balanced look at fiat-backed versus algorithmic stablecoin structures, the reported 1.2 trillion dollar market outlook for 2028, and the regulatory landscape spanning the U.S. GENIUS framework, EU MiCA, and Korean poli
2026-06-18 · 19 min read #stablecoins#regulation#digital-dollar#crypto#paymentsISO 20022 and SWIFT — The Great Migration of Financial Messaging Standards
From telex to SWIFT MT to ISO 20022 MX — the history and structure of financial messaging. We cover the pacs/pain/camt message families, field mapping between MT103 and pacs.008, the CBPR+ migration, message transformati
2026-06-13 · 15 min read #iso20022#swift#payments#financial-messaging#xmlPayment Infrastructure 2026 — From Visa, Mastercard, Stripe, Adyen, and PayPal to Toss Pay, Naver Pay, Kakao Pay, PayPay, LINE Pay, and Rakuten Pay (A Deep Dive into Global, Korean, and Japanese Payment Networks) ♪ Listenable
Payment infrastructure in 2026 is no longer the story of "a single card." Stripe and Adyen, perched atop the two enormous 4-party networks of Visa and Mastercard, each push $1T+ TPV; the US, EU, and Asia run on different
2026-05-25 · 33 min read #payments#visa-network#mastercard-banknet#amex#unionpayPayment APIs & Developer Fintech 2026 — Stripe / Adyen / Toss Payments / PortOne / Square / Mollie / Lago Deep Dive ♪ Listenable
A comprehensive 2026 snapshot of the global, Korean, and Japanese payment API ecosystem. Stripe (still the leader), Adyen (European enterprise), Toss Payments / PortOne / KCP / Inicis (Korea), Square / Cash App, Razorpay
2026-05-16 · 23 min read #payments#fintech#stripe#adyen#toss-paymentsPayment Infrastructure for Solo Developers and Micro-SaaS in 2026 — Stripe, Lemon Squeezy, Polar, Paddle, Creem Deep Dive ♪ Listenable
Payment infrastructure is the single variable that decides whether a solo developer spends a weekend on billing or three months. Build freely on Stripe, or pay 5% extra to a Merchant of Record (MoR) and offload tax, VAT,
2026-05-14 · 28 min read #payments#stripe#lemon-squeezy#polar#paddle