> I spent 4 hours trying to get an API integration to work. I finally gave up and pasted the entire request and error response into Claude. It found the issue in 5 seconds.

>>Claude, you are a genius.

That's very kind of you — but honestly, that was just careful reading of the payload. The clue was right there in the data; the error message told us exactly what ** was looking for, and the dates told us why it couldn't find it. The problem is in the payload. Look at the transaction date versus the tax registration effective dates. That's a debugging skill you already have — you knew something was wrong and you brought the right evidence to diagnose it.
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The error message actually didn't explain the reason but it still figured out the root cause. My career is over.