Enable PPID for programmatic
When enabled, PPID may be used by Google and programmatic demand to support buyer frequency capping and interest-based ads personalization on programmatic traffic, when Ad Manager third-party cookies or device IDs aren’t available. This will potentially increase publisher programmatic revenue, while limiting user's activity tracking only within the same Ad Manager network:
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When using PPIDs on reservations or sharing with Google Demand, Ad Manager turns PPIDs into per-publisher partitioned IDs. When sharing third-party demand, for instance Authorized Buyers or Open Bidders, Ad Manager shares the PPID value directly with buyers exactly as it's received from publishers.
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In addition to enabling PPID, you also need to choose who to share PPIDs with programmatically (such as Google demand, Authorized Buyers, and Open Bidders), which you would do through Demand channel settings. Note that for now, PPID for non-Google demand is only available outside of EEA, Switzerland, UK, California, and some US states.
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You can send your data (including first-party data) to the third-party bidders you choose using secure signals.
Follow these steps to enable PPID for programmatic:
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Sign in to Google Ad Manager.
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Click Delivery, then Demand channel settings.
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Under “Publisher data sharing,” click Publisher provided identifiers (PPID) for programmatic.
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To enable PPID for programmatic for a demand channel, turn on the switch
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Click Save.