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humanpropensity Gotta pass pseudonymous ID into GAM in the call parameters to use it through any of the systems that pass through GAM for bidding. In theory, the header bidders could handle it independently but without passing it to GAM as well it would make understanding the revenue lift v hard
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humanpropensity TBC: It is *very* standard that every ad call's data gets passed, completely the same, to both header bidders AND GAM, so publishers would have to change their behavior presumably and making those IDs available through Open Bidding/EBDA is totally out.
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humanpropensity Also, since GAM is the primary way that publishers forecast, if you want to direct sell against individualized IDs in any way you're going to have to do some gnarly hacks.
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