Here you will find example Preferred Deal and Private Exchange bid requests and responses for OpenRTB 2.2
A preferred deal (PD) is a deal ID-driven programmatic 1-on-1 integration/relationship with a publisher. The publisher creates a Deal ID and sets or negotiates a rate that the buyer can accept (by submitting a valid bid response) or decline (by not submitting a valid bid response) on an impression-by-impression basis.
Also known as private or closed auction; similar to a preferred deal, a private exchange (PX) is a closed-exchange setup where up to 25 DSPs with the PX’s Deal ID can bid on a publisher’s traffic. There’s no fixed rate; instead, there is a floor price, which is also submitted in the bid request.