dataLayer.push({
  "ecommerce": {
    "purchase": {
      "actionField": {
        "currencyCode": "NOK",
        "id": "order id",  //coming for your backend system
        "affiliation": "Online Store",
        "revenue": "250.00",
        "shipping": "20.00",
        "coupon": "activity code",  //order specific
      },
      "products": [{
               "id":"12345”,
               "name": "Bok: Viktingtidens utbrudd",  //name or id is required
               "price": "250.00",
               "category": "Hardcover",
               "quantity": 1
      }, {
               Product 2 //optional
      }]
    }
  },
  "event": "purchase"
});