Data discrepancies ACCOUNT_PERFORMANCE_REPORT and Adwords UI Report

[Aleksandr Aksenov]

Hello,

We have discrepancies in `Impressions` values between API `ACCOUNT_PERFORMANCE_REPORT` and Adwords UI Report. 

UI Report configured with next fields:

Row `Account`, `Customer ID`, `Device`,  `Network (with search partners)`, `Day`, `Hour of Day`

Column `Clicks`, `Impressions`, `CTR`, `Avg. CPC`, `Cost`, `Avg. CPM`

API report request:

```

curl --http1.1 --header "Authorization : Bearer <123>" --header "developerToken : <345>" --header "clientCustomerId: <567>" --header "includeZeroImpressions: FALSE" --data "__rdquery=SELECT Ctr,Quarter,DayOfWeek,Impressions,AdNetworkType1,Device,HourOfDay,AverageCpm,Cost,Date,Month,ClickType,Conversions,Year,AverageCpc,Interactions,Clicks,Week,InteractionTypes FROM  ACCOUNT_PERFORMANCE_REPORT DURING 20200707,20200707&__fmt=CSV" https://adwords.google.com/api/adwords/reportdownload/v201809

```

Even if we use only `Impressions`, `HourOfDay` and `Date` fields in API request, Impressions still do not match to UI report. 

Btw, `Impressions` between different API reports looks the same (for example, ACCOUNT_PERFORMANCE_REPORT vs ADGROUP_PERFORMANCE_REPORT).

UI report usually has more Impressions than API report.

Can you explain why Impressions do not match?

[Google Ads API Forum Advisor Prod]

Hello,

Thanks for reaching out! In order for me to take a closer look, can you please provide your customerClientId as well as the complete detailed logs of the request and response? Kindly provide these details via the Reply privately to author option.

Regards,

Danica Google Ads API Team

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