The payment API problems that only show up months later

Overview

Early integration always feels fine, it’s the stuff that surfaces after you’ve been live a while that actually hurts. Timeouts were the first one. We treated every timeout as a failure and retried, then found out some had actually gone through on their end, so we started double charging people. Error codes across different endpoints on the same provider weren’t even consistent with each other, so our handling logic that worked for one call quietly broke on another. API key rotation was another o

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