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Engineering

Everything we have written under Engineering.

Engineering 29 Aug 2026 · 3 min read Idempotency: why your endpoint must survive being called twice Postbacks are delivered at least once, not exactly once. Everything else in this article follows from that sentence. Read it

Engineering 26 Aug 2026 · 3 min read Chargebacks and reversals: when a network takes the money back A conversion can be taken back days after it was paid. Here is how that arrives, what it does to your balance, and what to do about the user who already spent it. Read it

Engineering 22 Aug 2026 · 3 min read Verifying a postback signature in PHP, Node and Python Working code in three languages, and the two mistakes that make a signature check worthless while still looking correct. Read it

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