A race condition in a payment webhook handler sat undetected for 3 weeks. When it fired, it double-charged 4 customers. Here's the full postmortem and why I now test billing code differently.
I want to tell you about a bug. Not a fun one. Not a clever one. The kind that makes your stomach drop when you get the Slack notification at 11pm on a Thursday.
I was building subscription billing for Nexural. Stripe webhook comes in — \\
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