GPT-guides-passback-tags Ad Manager docs
Google Publisher Tag (GPT) enables the creation of passback tags, which allow a third-party ad server to ultimately fill an ad request with an ad from your Google Ad Manager network. Passback tags are commonly used for serving remnant or fallback ads when a third-party server lacks an eligible ad or when an ad doesn't meet pricing requirements. They can also be utilized to serve ads from your Ad Manager network on another publisher's website or for delivering video ads. Passback tags must be rendered within an iframe to prevent them from inheriting page-level settings and can be configured wit
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