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  • Send Highest Bid to Third Party:  The ad call is directed to the Xandr impression bus first.  The impression bus holds an auction as usual among its bidders and then passes the highest bid on to a third-party system to decide how to fill the ad call.   Only if If the highest Xandr bid is chosen as the winner will , then the ad call be passed back to Xandr , where the impression us will serve the winning bidder's creative.