code: func (h *Client) ProductActionList(productActionList string) *Client {
  	h.productActionList = productActionList
  	h.productActionListSet = true
  	return h
  }
docs: // The list or collection from which a product action occurred.
  // This is an additional parameter that can be sent when Product
  // Action is set to 'detail' or 'click'. For analytics.js the
  // Enhanced Ecommerce plugin must be installed before using
  // this field.