Data Layer 1.0 Script to be Removed from Checkout Settings

The script in your checkout settings will contain your GTM ID and may be slightly different than the code below, however you'll find the code begins with the Google Tag Manager comment and ends with noscript tag.

    <!-- Google Tag Manager -->
    <script>
    (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({"gtm.start":
      new Date().getTime(),event:"gtm.js"});var f=d.getElementsByTagName(s)[0],
      j=d.createElement(s),dl=l!="dataLayer"?"&l="+l:"";j.async=true;j.src=
      "https://www.googletagmanager.com/gtm.js?id="+i+dl;f.parentNode.insertBefore(j,f);
    })(window,document,"script","dataLayer","GTM-OOOOOO");
    </script>
    <!-- End Google Tag Manager -->
    <script>
    window.dataLayer = window.dataLayer || [];
    </script>

  {% if first_time_accessed %}
      <script>
        var elevarLineItems = []
        window.addEventListener('load', function(){
          window.dataLayer = window.dataLayer || [];
  
          {% if customer %}
            window.dataLayer.push({
              "VisitorType": "Logged In",
              "visitorId": "{{ customer.id | remove: "'" }}",
              "CustomerId": "{{ customer.id | remove: "'" }}",
              "CustomerEmail": "{{ customer.email }}",
              "CustomerFirstName": "{{ customer.first_name }}",
              "CustomerPhone": "{{ customer.default_address.phone }}",
              "CustomerLastName": "{{ customer.last_name }}",
              "CustomerCity": "{{ customer.default_address.city }}",
              "CustomerZip": "{{ customer.default_address.zip }}",
              "CustomerAddress1": "{{ customer.default_address.address1 }}",
              "CustomerAddress2": "{{ customer.default_address.address2 }}",
              "CustomerCountryCode": "{{ customer.default_address.country_code }}",
              "CustomerProvince": "{{ customer.default_address.province }}",
              "CustomerOrdersCount": "{{ customer.orders_count }}",
              "CustomerTotalSpent": "{{ customer.total_spent | divided_by: 100 }}",
            });
          {% else %}
            window.dataLayer.push({
              "VisitorType": "Guest"
            });
          {% endif %}
  
          elevarLineItems = {{ order.line_items | json }};
  
          window.dataLayer.push({
            "pageType": "purchase",
            "event": "transactionComplete",
            "ecommerce": {
              "currencyCode": "{{ order.currency }}",
              "purchase": {
                "actionField": {
                  "id": "{{order.order_number}}",
                  "revenue": "{{total_price | times: 0.01}}",
                  "tax": "{{tax_price | times: 0.01}}",
                  "shipping": "{{shipping_price | times: 0.01}}",
                  "affiliation": "{{ shop.name }}",
                  "discountAmount": "{{ checkout.discounts_amount | money_without_currency | remove: ','  }}",
                  {% if order.discounts %}
                    "coupon": "{{ order.discounts[0].code }}",
                  {% endif %}
                },
                "products": elevarLineItems.map(function(item, idx) {
                  return {
                    "name": item.product.title,
                    "id": item.sku,
                    "productId": item.product.id,
                    "variantId": item.variant_id,
                    "shopifyId": item.product.id + "_" + item.variant_id,
                    "price": item.price,
                    "brand": item.vendor,
                    "category": item.product.product_type,
                    "variant": item.variant.title,
                    "quantity": item.quantity
                  }
                })
              }
            }
          });
        }, false);
      </script>
  {% endif %}
  <noscript>
      <iframe src='https://www.googletagmanager.com/ns.html?id=GTM-OOOOOO' height='0' width='0' style='display:none;visibility:hidden'></iframe>
  </noscript>