<script>
  window.dataLayer = window.dataLayer || [];
  dataLayer.push({
    'event': 'ProductImpressions',
    'ecommerce': {
      'impressions': [{ //first product
          'name': 'iPhone XS', //product name
          'id': '007154', //product article
          'price': '999.00', //unit price
          'category': 'Shop/Buy iPhone', //product category
          'brand': 'Apple', //product brand, constant value
          'list': 'iPhones', //list name
          'position': 1 //position of a product in the list
        }, { //second product
          'name': 'iPhone XS Max',
          'id': ' 133801 ',
          'price': '1099',
          'category': 'Shop/Buy iPhone',
          'brand': 'Apple',
          'list': 'iPhones',
          'position': 2
        }
        //more details about the product
      ]
    }
  });