Unity RTB error 1000: Failed Unity validator
What Unity Exchange says
The bid failed validation due to compliance with Unity's OpenRTB standards described in the request-response integration guides.
Unity Exchange reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Unity RTB error 1000 is this code.
What to change
Validate the bid response against the OpenRTB version Unity sent before it leaves your bidder. Unity's validator rejected the payload.