code: def end_campaign(campaign_id, options={})
        response = connection.post do |req|
          req.url "campaigns/#{campaign_id}/end", options
        end
          return_error_or_body(response, response.body.code)
      end
docs: End a campaign
   Details on param can be found at https://developer.foursquare.com/docs/campaigns/end
  
   @campaign_id String :campaignId - The ID of the campaign to end. Must be specified. Pass in as a string and not as a hash.