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Impression level tracking with Admob Mediation
Firebase and Admob have an automatic integration, but the revenue amount is not exported to BigQuery. Not being able to export this information means you won’t be able to export or utilize impression-level data outside of the Firebase dashboard. This article outlines our recommended way to implement impression-level tracking with Admob mediation.
You can gather the impression value by using the Admob paid event handler.
We recommend you call the impression event something other than ad_impression since it would generate duplicate counts in the Firebase dashboard.