A parameter to group (segment) results by various dimensions. Common breakdowns include demographic and placement fields such as age, gender, country, impression_device, etc. Each breakdown creates separate rows in the report for each value of that field. For example, breakdowns=['age','gender'] will show separate metrics for each age/gender combination. Not all breakdowns can be combined arbitrarily (see API docs for valid combinations).
breakdowns=['country','publisher_platform']
