Chartboost RTB error 4: Invalid Deal ID
What Chartboost says
The deal id on the bid did not match a Chartboost deal.
Chartboost reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Chartboost RTB error 4 is this code.
What was checked
Chartboost rejected the bid before price comparison. OpenRTB groups 1 through 10 as a response the exchange could not use: a bad id, missing markup, a missing price, or a domain it will not accept.
What to change
Bid the deal id Chartboost sent, or omit it on an open auction.
The same number in OpenRTB
OpenRTB loss reason 4 is Invalid Deal ID. Chartboost publishes this integer with that meaning.