In order to investigate impression discrepancies on an Index HeaderTag integration, we can compare SFP's "Rendered Impressions" to Google Ad Manager Impressions to measure the difference.
- Time Zone (If your GAM account allows you to adjust this): UTC (this is the timezone Sharethrough reports in)
- Date Range: Last 7 days
- Filters: “Advertiser” = “Sharethrough” (or whatever your Sharethrough Index HeaderTag advertiser is named)
- Dimensions: Date, Ad unit (All levels)
- Metrics: Total impressions
Then run the query and export the results as a CSV and email it to firstname.lastname@example.org.