code: func (h *Client) PromotionPosition(promotionPosition string) *Client {
  	h.promotionPosition = promotionPosition
  	h.promotionPositionSet = true
  	return h
  }
docs: // The position of the creative. 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.