GA4 - add_to_cart - Duni

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window.dataLayer.push({
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  ecommerce: {
    currency: "GBP",
    value: 69.61,
    items: [
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      item_id: "168432",
      item_name: "Duni Elegance® Napkin Lily 40 x 40 cm White, 240 pcs/box (6 x 40 pcs)",
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      coupon: "Summer Sale",
      discount: 2.22,
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      item_brand: "Duni",
      item_category: "Napkins",
      item_category2: "Dinner Size Napkins Unicolour",
      item_category3: "Duni Elegance Lily",
      item_list_name: "Category - Napkins",
      item_variant: "White",
      price: 69.61,
      quantity: 1
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