code: func (h *Client) ProductBrand(productBrand string) *Client {
  	h.productBrand = productBrand
  	h.productBrandSet = true
  	return h
  }
docs: // The brand associated with the product. Product 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.