code: func (h *Client) PromotionName(promotionName string) *Client {
  	h.promotionName = promotionName
  	h.promotionNameSet = true
  	return h
  }
docs: // The name of the promotion. Promotion index must be a positive
  // integer between 1 and 200, inclusive. For analytics.js the
  // Enhanced Ecommerce plugin must be installed before using
  // this field.