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3 stories

Banner: customers in Japan and Korea charged 100 times the price because of zero-decimal currencies

Programming Languages Bug Report

Customers in Japan and Korea charged 100x: zero-decimal currencies multiplied by 100

Daniel Tran · Jan 20, 2026 · 8 min read

We launched local pricing in JPY, KRW and VND and a customer in Osaka was charged 398,000 yen for a 3,980 yen course. Our code multiplied every price by 100 before sending it to Stripe. How we found it, refunded it and built a per-currency exponent table with tests.

Banner: invoice total and payment receipt that differ by a single cent

Programming Languages Bug Report

JavaScript invoice totals off by one cent: floating point money rounding

Daniel Tran · Feb 18, 2025 · 8 min read

Our PDF invoices and the amounts charged through Stripe disagreed by a cent on 214 invoices in one month. Floats, toFixed and rounding at every step were to blame. We moved to integer minor units with one explicit rounding point.

Banner: Stripe webhook fails with no signatures found matching the expected signature for payload

Web Development Bug Report

Stripe webhook fails: No signatures found matching the expected signature for payload

Daniel Tran · Nov 21, 2024 · 9 min read

After a harmless-looking Express refactor, every Stripe webhook failed verification and paid bookings stayed pending. A global JSON parser consumed the body before constructEvent saw it. How we found it, fixed the route and replayed the missed events.