Good afternoon.  I'd like to use the API to pull exactly the same data that 
users are used to seeing in the AdWords web GUI (e.g., 
https://adwords.google.com/mcm/Mcm?__u=123&__c=456#c).  By pulling a 
SEARCH_QUERY_PERFORMANCE_REPORT, an 
AUTOMATIC_PLACEMENTS_PERFORMANCE_REPORT, and a 
MANAGED_PLACEMENTS_PERFORMANCE_REPORT for each account, summing the 
results, I get *close* for clicks, conversions, and spend.  Typically the 
numbers reported by the API are higher by about 1%.  I can write this off 
as being due to time zone differences or other edge cases.

However, the API is returning much lower impressions, around one third what 
the GUI gives.  Is there another report I need which is likely to fill in 
the impressions?

I'm comparing numbers for April, so any small retroactive changes should 
long since has settled out.

While the breadth of the gap varies, it's fairly consistent across 
accounts; the web GUI may be twice as high for one account, and five times 
as high for another.  There's one exception; we have a TV account with tens 
of millions of impressions per the web GUI, but for which I get no records 
at all when using the API.  The reports complete without errors, they just 
contain no rows after the header.  That's probably a separate issue, I just 
mention it in case it sparks any light bulbs.  I'm not familiar with web 
advertising, I'm a data guy not a marketing guy, so I'm not sure what's 
relevant.

When I've drilled into specific accounts, the gap is fairly consistent 
across all campaigns.

My API queries have not included any filtering, other than dates.  I 
typically query three or four days' data at a time, to avoid sampling (this 
was an issue with the Google Analytics API, I don't know if it also applies 
to AdWords).

It would be much more convenient and intuitive if there was a single report 
which gave the same dimensions and metrics as the web view.  Perhaps one 
exists, which I've missed?  I've not found a web page which describes what 
data can be found in each report.  This 
page<https://developers.google.com/adwords/api/docs/reference/latest/ReportDefinitionService.ReportDefinition.ReportType>has
 a uselessly brief summary; this 
page <https://developers.google.com/adwords/api/docs/appendix/reports>lists the 
fields available for each report, but gives no information on 
which *records* are included - unfortunately the answer is not "all".

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