<script>
gtag('event', 'begin_checkout', {
  "currency": "EUR",
  "value": 2, // Sum of prices for the products in the checkout cart
  "items": [ // Array with the products in the checkout cart
    {
      "id": "P12345",
      "name": "Android Warhol T-Shirt",
      "brand": "Google",
      "category": "Apparel/T-Shirts",
      "variant": "Black",
      "quantity": 1,
      "price": 2,
      "google_business_vertical": "retail"
    },
   {
      "id": "P67890",
      "name": "Flame challenge TShirt",
      "brand": "MyBrand",
      "category": "Apparel/T-Shirts",
      "variant": "Red",
      "quantity": 1,
      "price": 3,
      "google_business_vertical": "retail"
   }
  ]
});
</script>