code: func (h *Client) ProductImpressionSKU(productImpressionSKU string) *Client {
  	h.productImpressionSKU = productImpressionSKU
  	h.productImpressionSKUSet = true
  	return h
  }
docs: // The product ID or SKU. Impression List index must be a positive
  // integer between 1 and 200, inclusive. 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.