Chartboost RTB error 5: Bid response impid does not match the auction id
What Chartboost says
Chartboost's table says the bid response's impid does not match the auction id.
Chartboost reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Chartboost RTB error 5 is this code.
What to change
Set impid to the impression id from the request Chartboost sent.
The same number in OpenRTB
OpenRTB loss reason 5 is Invalid Auction ID. Chartboost publishes a different reading of this integer. Use the wording above when the loss came from Chartboost.