Hi,
We download data on click types from the API - when you add up the impressions for the click types they do not match what would be expected. It appears "Headline" is always correct when taken by itself, but for instance the "Phone Calls" segment - when you add those in, that takes you past the expected total impressions. There is even a note in the AdWords UI about this -
"Calls
The number of clicks on your phone number when your ad is shown on a mobile device. This includes clicks on either a phone number in your ad text (in the US and UK) or on a call extension. Since some ads may display both a display URL and a click-to-call phone number, impression counts for these ads may not reconcile within this table."
How should we handle this?
Thanks
Justin