GA4 - begin_checkout - Duni

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  event: "begin_checkout",
  ecommerce: {
    currency: "GBP",
    value: 265.93,
    coupon: "Summer Sale",
    items: [
     {
      item_id: "199149",
      item_name: "Dunisoft® Napkin 40 x 40 cm Woven Kiwi, 360 pcs/box (6 x 60 pcs)",
      affiliation: "Online Store",
      coupon: "Summer Sale",
      discount: 2.22,
      item_brand: "Duni",
      item_category: "Napkins",
      item_category2: "Dinner Size Napkins Design",
      item_category3: "Dunisoft",
      item_variant: "Woven Kiwi",
      price: 95.21,
      quantity: 2
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    {
      item_id: "198817",
      item_name: "Dunicel® Tête-à-Tête 0,4 x 24 m Sun Orange, 4 pcs/box (4 x 1 pcs)",
      affiliation: "Online Store",
      coupon: "Summer Sale",
      discount: 3.33,
      item_brand: "Duni",
      item_category: "Table Coverings",
      item_category2: "Tablerunners Unicolour",
      item_category3: "Dunicel Tête à tête",
      item_variant: "Sun Orange",
      price: 75.51,
      quantity: 1
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