<script>
gtag('event', 'add_to_cart', {
  "currency": "EUR",
  "value": 2, // Price (or sum of prices if quantity is more than 1) for the product added to cart
  "items": [ // Array with the product added to cart
    {
      "id": "P12345",
      "name": "Android Warhol T-Shirt",
      "brand": "Google",
      "category": "Apparel/T-Shirts",
      "variant": "Black",
      "quantity": 1,
      "price": 2,
      "google_business_vertical": "retail"
    }
  ]
});
</script>