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Display Reservation media refers to ads that you can purchase on certain Google sites (like YouTube) where you can 'reserve' impressions in advance at a set cost. This policy applies to North America only and isn't applicable to any current initiatives regarding Ad Exchange or Active View reservation-based buys.
Display Reservation media that's purchased on YouTube or Google Owned & Operated Properties (like Google Finance) are billed based on Google's measurements of impressions.
Google supports third-party billing for Display Reservation campaigns from third-party ad servers certified on our properties. If your third-party ad server is certified to serve impressions or track media on Google properties, and you meet certain eligibility requirements, Google can bill based off a third party's measurement of impressions, as long as those impressions are less than 10% of Google's measurement (per industry standard). If impression counts vary by 10% or more, Google's invoice will calculate charges based on our measurements.
Certified third-party ad servers that support third-party billing
Third-party ad servers are certified by property and are listed on our YouTube Ad Specs guide. For a list of vendors that are certified for advertising on YouTube, please see our YouTube Vendors page. Please note that not all vendors are currently supported for third-party billing. Please reach out to your Google sales representative for more details.
How to set up third-party billing
Your Google sales team can assist you in confirming that third-party billing is set up for your Display Reservation campaigns. Please contact your Google sales representative for more information.