code: def summary(self, campaign_id=None):
          
          resource_cls = CampaignSummary
          single_resource = False
  
          if not campaign_id:
              resource_cls = CampaignSummaries
              single_resource = True
  
          return super(API, self).get(
              resource_id=campaign_id,
              resource_action='summary',
              resource_cls=resource_cls,
              single_resource=single_resource)
docs: Returns the campaign summary