Customer Events Example

analytics.subscribe("checkout_completed", event => {

  (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-XXXXXXX');

  var totalDiscount = 0;
  var shippingDiscount = event.data.checkout.discountApplications.find(discount => discount.targetType === "SHIPPING_LINE");

    if (shippingDiscount) {
        shippingDiscount = "true";
        totalDiscount += event.data.checkout.shippingLine.price.amount;
    }
    else {
        shippingDiscount = "false";
    }

    event.data.checkout.lineItems.forEach(lineItem => {
      lineItem.discountAllocations.forEach(discountAllocation => {
        totalDiscount += discountAllocation.amount.amount;
      });
    });

    var items = event.data.checkout.lineItems.map(item => ({
      item_name: item.variant.product.title,
      item_id: item.variant.product.id,
      currency: item.variant.price.currencyCode,
      price: item.variant.price.amount - item.discountAllocations[0].amount.amount,
      price_before_discount : item.variant.price.amount,
      item_category: item.variant.product.type,
      item_category5: item.variant.title,
      item_variant: item.variant.title,
      quantity: item.quantity
    }));

    async function hashString(input) {
      const encoder = new TextEncoder();
      const data = encoder.encode(input);
      const hash = await crypto.subtle.digest('SHA-256', data);
      return Array.from(new Uint8Array(hash)).map(byte => byte.toString(16).padStart(2, '0')).join('');
    }

    (async () => {
    const inputString = event.data.checkout.email;
    const hashedEmail = await hashString(inputString);
    dataLayer.push({
      event: 'purchase',
      email: event.data.checkout.email,
      hashed_email: hashedEmail,
      first_name: event.data.checkout.billingAddress.firstName,
      last_name: event.data.checkout.billingAddress.lastName,
      address: event.data.checkout.billingAddress.address1,
      city: event.data.checkout.billingAddress.city,
      state: event.data.checkout.billingAddress.provinceCode,
      country: event.data.checkout.billingAddress.countryCode,
      zipcode: event.data.checkout.billingAddress.zip,
      phone: event.data.checkout.billingAddress.phone,
      ecommerce: {
          currency: event.data.checkout.currencyCode,
          value: event.data.checkout.totalPrice.amount,
          tax: event.data.checkout.totalTax.amount,
          shipping: event.data.checkout.shippingLine.price.amount,
          affiliation: 'example',
          transaction_id: event.data.checkout.order.id,
          coupon: event.data.checkout.discountApplications[0].title,
          shipping_discount: shippingDiscount,
          total_discount: totalDiscount,
          items: items
      }
    });

  console.log(dataLayer);
})();


});