A computer-implemented method includes receiving, at a transaction management computing subsystem of an advertising platform, a call for an advertisement creative to be served to an impression consumer; generating, using the transaction management computing subsystem, a set of bid requests, at least two bid requests of the set including respective subsets of user data store information associated with the impression consumer; and sending, by the transaction management computing subsystem, the set of bid requests to a set of bidding computing subsystems, each bidding computing subsystems being operable to generate a bid response based on the information included in its bid request.