window.dataLayer = window.dataLayer || [];
window.dataLayer.push({
event: "GA4_begin_checkout",   // name of the event. In this case, it always must be GA4_begin_checkout
  ecommerce: {
    currency: "GBP",
    value: 100.00,               // total value - all items
    items: [
    {
      item_id: "product1",                       // insert an actual product id
      item_name: "2013 Blanc de Blancs Brut",         // insert an product name
      item_brand: "Item brand",                     // insert an actual product brand
      item_category: "Standard Bottles Wine",                 // insert an actual product top-level category
      price: 65.00,                               // insert an actual product price
      quantity: 1                               // product quantity
    },
    {
      item_id: "product2",                       // insert an actual product id
      item_name: "Non Vintage Brut",         // insert an product name
      item_brand: "Item brand",                     // insert an actual product brand
      item_category: "Standard Bottles Wine",                 // insert an actual product top-level category
      price: 35.00,                               // insert an actual product price
      quantity: 1                               // product quantity
    }]
  }
});