Checkout DataLayer Modify

gistfile1.liquid

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    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 : "";
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    j.src = "https://www.googletagmanager.com/gtm.js?id=" + i + dl;
    f.parentNode.insertBefore(j, f);
  })(window, document, "script", "dataLayer", "GTM-xxxxxxx");
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<!-- GTM DataLayer -->
<script>
  var transactionId = "{{ order.order_number | replace: '#', '' | default: checkout.id | replace: '#', '' }}";
  var order_number = "{{ order.order_number | replace: '#', ''}}";
  var checkout_id = "{{ checkout.id | replace: '#', '' }}";
  var trackedOrderIds = window.localStorage.getItem('trackedOrderIds') ? JSON.parse(window.localStorage.getItem('trackedOrderIds')) : [];

  if(transactionId && !trackedOrderIds.includes(order_number) && !trackedOrderIds.includes(checkout_id)) {
    dataLayerInit();
  }

  function dataLayerInit() {
    window.dataLayer = window.dataLayer || [];

    const eventPrefix = '';
    const formatedItemId = true;
    const dataSchema = {
      ecommerce: {
          show: true
      },
      dynamicRemarketing: {
          show: false,
          business_vertical: 'retail'
      }
    }


    // customer information
    const currentUser = {};
    {% if customer %}
      currentUser.id = {{ customer.id }};
      currentUser.first_name = "{{ customer.first_name }}";
      currentUser.last_name = "{{ customer.last_name }}";
      currentUser.full_name = "{{ customer.name }}";
      currentUser.email = "{{ customer.email }}";
      currentUser.phone = "{{ customer.default_address.phone }}";
      currentUser.new_customer = {% if customer.orders_count < 2 %}true{% else %}false{% endif %};

      {% if customer.default_address %}
        currentUser.address = {
          address_summary: "{{ customer.default_address.summary }}",
          address1: "{{ customer.default_address.address1 }}",
          address2: "{{ customer.default_address.address2 }}",
          city: "{{ customer.default_address.city }}",
          street: "{{ customer.default_address.street }}",
          zip_code: "{{ customer.default_address.zip }}",
          company: "{{ customer.default_address.company }}",
          country: "{{ customer.default_address.country.name }}",
          country_code: "{{ customer.default_address.country_code }}",
          province: "{{ customer.default_address.province }}"
        };
      {% endif %}
    {% elsif checkout.customer %}
      currentUser.id = {{ checkout.customer.id }};
      currentUser.first_name = "{{ checkout.customer.first_name }}";
      currentUser.last_name = "{{ checkout.customer.last_name }}";
      currentUser.full_name = "{{ checkout.customer.name }}";
      currentUser.email = "{{ checkout.customer.email }}";
      currentUser.phone = "{{ checkout.customer.default_address.phone }}";
      currentUser.new_customer = {% if checkout.customer.orders_count < 2 %}true{% else %}false{% endif %};

      {% if checkout.billing_address %}
        currentUser.address = {
          address_summary: "{{ checkout.billing_address.summary }}",
          address1: "{{ checkout.billing_address.address1 }}",
          address2: "{{ checkout.billing_address.address2 }}",
          city: "{{ checkout.billing_address.city }}",
          street: "{{ checkout.billing_address.street }}",
          zip_code: "{{ checkout.billing_address.zip }}",
          company: "{{ checkout.billing_address.company }}",
          country: "{{ checkout.billing_address.country.name }}",
          country_code: "{{ checkout.billing_address.country_code }}",
          province: "{{ checkout.billing_address.province }}"
        };
      {% endif %}
    {% endif %}

    if (currentUser.email) {
      currentUser.hash_email = "{{ currentUser.email | sha256}}"
    }

    if (currentUser.phone) {
      currentUser.hash_phone = "{{ currentUser.phone | sha256}}"
    }

    dataLayer.push({
      customer: currentUser
    });


    // purchase event
    const couponCode = [];
    {% for discount_application in discount_applications %}
      couponCode.push("{{ discount_application.title }}")
    {% endfor %}


    dataLayer.push({ ecommerce: null });

    const dataLayerData = {
      event: eventPrefix + "purchase",
      ecommerce: {
        transaction_id: "{{ checkout.order_number | replace: '#', '' | default: checkout.id | replace: '#', '' }}",
        value: {{ checkout.total_price  | times: 0.01 }},
        tax: {{ checkout.tax_price | times: 0.01 }},
        shipping: {{ checkout.shipping_price | times: 0.01 }},
        discount: {{ checkout.discounts_amount | times: 0.01 }},
        currency: "{{ checkout.currency }}",
        coupon: couponCode.join(','),
        items: [
          {% for line_item in line_items %}
            {
              item_id: formatedItemId ? "shopify_{{ shop.address.country_code }}_{{ line_item.product_id }}_{{ line_item.variant.id }}" : "{{ line_item.product_id }}",
              product_id: "{{ line_item.product_id }}",
              variant_id: "{{ line_item.variant.id }}",
              item_name: "{{ line_item.product.title }}",
              {% if line_item.variant.title != "Default Title" %}
                'item_variant': "{{ line_item.variant.title }}",
              {% endif %}
              discount: {{ line_item.line_level_total_discount | times: 0.01 }},
              sku: "{{ line_item.sku }}",
              price: {{ line_item.final_price | times: 0.01 }},
              quantity: {{ line_item.quantity }},
              item_brand: "{{ line_item.vendor }}",
              item_category: "{{ line_item.product.type }}"
            },
          {% endfor %}
        ]
      }
    }

    if(dataSchema.dynamicRemarketing && dataSchema.dynamicRemarketing.show) {
      dataLayerData['dynamicRemarketing'] = {
          value: dataLayerData.ecommerce.value,
          items: dataLayerData.ecommerce.items.map(item => ({id: item.item_id, google_business_vertical: dataSchema.dynamicRemarketing.business_vertical}))
      }
    }

    if(!dataSchema.ecommerce ||  !dataSchema.ecommerce.show) {
      delete dataLayerData['ecommerce'];
    }

    dataLayer.push(dataLayerData);
    window.localStorage.setItem('trackedOrderIds', JSON.stringify([...trackedOrderIds, transactionId]))
  };
</script>
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