What is the trigger timing for BidExt.impression_tracking_url
陈秀
Background:
When using the Google OpenRTB protocol, there is a paragraph in the document that states: "To limit discrepancies, we recommend using the BidResponse.seatbid[].bid[].ext.impression_tracking_url field for all inventory, including native. Buyers should remove impression tracking pixels from the creative (ad markup), and include the impression_tracking_url field (string array) in the bid response instead. BidResponse.seatbid[].bid[].burl can also be used. The impression_tracking_url fires when the impression is considered billable. This provides more accuracy than tracking pixels, which can track impressions that, because of prefetching, were fetched by the app but never rendered."
For banner, native, and video ads, all billing links are placed in BidExt.impression_tracking_url. The impression tracking is removed from the adm, retaining only Visible impression tracking. After delivering the ads, it was found that the number of BidExt.impression_tracking_url for banner ads is lower than the number of Visible impression tracking in the adm.
Issues:
1. What is the trigger timing for BidExt.impression_tracking_url? "billable" is not a clear concept.
2. What impact would there be if BidExt.impression_tracking_url is set and impression tracking is not removed from the adm for banner, native, and video ads?
Authorized Buyers API Forum Advisor
The guidance concerning impression tracking URLs is also applicable to Google's RTB protocol, and is intended to prevent confusion concerning metrics for ads that are placed (e.g. the winning bid) that Google bills customers for versus those that are not viewed by users for some reason. It is called "billable", referring to the fact that these are the cases where you are billed for the ad being placed.
It would be working as intended for the impression tracking URL to receive less pings than your tracking pixel embedded in the creative, since it is expected for there to be less billable impressions.
The documentation's text concerning removal of impression tracking from creatives is a recommendation. Note however that we anticipate that the impression count via the embedded tracker will differ, and that is expected behavior. It won't be an accurate representation of billable impressions for the creative.
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