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the integration detail that decided the build
The supplier pricing API returned 200 before the write landed, which is how we ended up sending the same quote request three times in testing. Idempotency key on our side, keyed on the quote id. Problem gone. But it is worth saying out loud because no demo shows you this part, and it is the part that decides whether the thing survives a real week. Second thing that nearly broke it: one supplier record in forty arrives with no currency field. We validate on ingest and alert on the gap now, rather than finding out from a customer.