code: func (h *Client) ProductImpressionPosition(productImpressionPosition int64) *Client {
  	h.productImpressionPosition = productImpressionPosition
  	h.productImpressionPositionSet = true
  	return h
  }
docs: // The product's position in a list or collection. 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.