AdWords API Scripts - Tracking campaign expenditure with Google Sheets

Hi all,

I am trying to do some basic scripting here, I wish to track daily expenditure for a subset of my AdWords campaigns and log this into a Google Spreadsheet. From there, I will set up budget monitoring which will update daily so i can adjust (for overspend/underspend). I am using a script created by Google Adwords team which I am trying to modify bud here's the problem:

>> Where can I find the reference to field names in the API? ('Clicks', 'Impressions', 'AveragePosition', ...)

Here is the part of the script which is bugging me: 

while (date.getTime() <= yesterday.getTime()) {

    var row = getReportRowForDate(date);

    rows.push([

      new Date(date), 

      row['Cost'], 

      row['AverageCpc'], 

      row['Ctr'],

      row['AveragePosition'], 

      row['Impressions'], 

      row['Clicks']

      ]);

    spreadsheet.getRangeByName('last_check').setValue(date);

    date.setDate(date.getDate() + 1);

  }

I am interested in some of these fields but I cant some other as well.

Many thanks!

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