Get account list with no conversions or calls since last 30 days

Hi, I'm trying to figure out how to get the following done via PHP:

   - Get the list of accounts with active campaigns that get no conversions or calls during 30 days.

The campaigns are created on Adwords Express.

I am quite confused about how to make it. I don't see conversions on the type Campaign object, should I use ReportDefinitionService?

Thanks

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