Hello Jake,
I see that those are macros from the VAST 3.0 spec, but my understanding is that we don't make any alterations to the VAST XML at serving time, so by extension that would mean that we don't support macros there. We do
support our own and OpenRTB's macros in cases where you specify a video URL containing them, but again, they wouldn't be expanded in the XML.
Regards,
Mark
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