Manual Specification of Stored Responses in OpenRTB
A storedauctionresponse ID can be specified in imp.ext.prebid. If specified, then the behavior of Prebid Server changes:
The rest of the ext.prebid block is irrelevant and therefore ignored.
Nothing is sent to any bidder adapter for that imp.
The response retrieved for the specified ID (an array of objects) will be used to create the seatbid response. There can be multiple bidders in a single storedauctionresponse; if there are multiple imps from the same bidder, seatbid objects are properly merged.
The impid of the original request is copied through to the response.
So for example, this OpenRTB request:
Could result in this response, assuming that the IDs exist in the database table read by Prebid Server: