Code to be added to Checkout under "Additional content & scripts" in order to send transaction data to Google Analytics using Enhanced Ecommerce (Universal)

ga-ec-transactions.liquid

<script type="text/javascript">
{% for line_item in order.line_items %}
ga('ec:addProduct', {
  'id': '{{line_item.id}}',
  'name': '{{line_item.product.title}}',
  'category': '{{line_item.product.type}}',
  'brand': '{{line_item.vendor}}',
  'variant': '{{line_item.variant.option1}} {{line_item.variant.option2}} {{line_item.variant.option3}}',
  'price': '{{line_item.price | money_without_currency}}',
  'quantity': {{line_item.quantity}}
});
{% endfor %}
ga('ec:setAction', 'purchase', {
  'id': '{{order.order_number}}',
  'revenue': '{{order.total_price | money_without_currency}}',
  'tax': '{{order.tax_price | money_without_currency}}',
  'shipping': '{{order.shipping_price | money_without_currency}}',
  'coupon': '{% for discount in order.discounts %}{{discount.code}}{% endfor %}'
});
</script>