edition = "2023"; package com.iabtechlab.openrtb.v2; import "com/iabtechlab/openrtb/v2/openrtb.proto"; extend BidRequest.Imp.Ext { OxImpExtData data = 4000; // OpenX range: 4000–4999 } message OxImpExtData { string pbadslot = 1; repeated CustomData customdata = 2; message CustomData { string provider = 1; string value = 2; } }