View Source OpenRtbEcto.V2.BidRequest.Data (OpenRtbEcto v0.6.5)
The data and segment objects together allow additional data about the related object (e.g., user, content) to be specified. This data may be from multiple sources whether from the exchange itself or third parties as specified by the id field. A bid request can mix data objects from multiple providers. The specific data providers in use should be published by the exchange a priori to its bidders.