/*
ga('ec:addImpression', {
'id': "BP_486374", // Product ID.
'name': "Hakurakusei Junmai Daiginjo Special A Ranked 29% (伯楽星 純米大吟醸 特A地区東条秋津産山田錦29%) (Limited time offer item – other promotion offers and W Rewards are not applicable)", // Product name.
'category': "[]", // Product category.
'brand': "Hakurakusei", // Product brand.
'variant': "", // Product variant.
'list': "Product Searching List", // Specify the place showing the product.
'position': 1 // Product position (number).
});
ga('send', 'pageview'); // When finish firing the impression data of the displayed products
*/