def create_promotion(promotion_short_name, options={})
      response = connection.post do |req|
        req.url "promotions/#{promotion_short_name}", options
      end
      return_error_or_body(response)
    end
def create_promotion(promotion_short_name, options={})
      response = connection.post do |req|
        req.url "promotions/#{promotion_short_name}", options
      end
      return_error_or_body(response)
    end
Create a promotion for campaign
 param [String] promotion_short_name The promotion_type eg: custom_activity or twitter_activity
 param [Integer] campaign_id - The ID of the campaign
 param [Hash]  promotion - promotion create paramaters
   @param [Hash] options
   @option options String :title
   @option options String :participant_status_message
   @option options Hash :custom_activity_node - If custom_activity
     @option custom_activity_node String :name
   @option options Hash :trigger_schedule
     @options trigger_schedule String :winner_picked
     @options trigger_schedule String :rewarding
     @options trigger_schedule Integer :interval
   @option options Hash :reward
     @options reward String :type
     @options reward Integer :reward_points