checkout-snippet.liquid

{% comment %}
	Export cart contents for shopify-gtm-instrumentor such that they are similar
	to the schema from the Storefront API.
{% endcomment %}
<script>
	window.CHECKOUT_FOR_GTM_INSTRUMENTOR = {
		id: {{ checkout.id }},
		subtotalPrice: '{{ checkout.line_items_subtotal_price | money_without_currency }}',
		totalPrice: '{{ checkout.total_price | money_without_currency }}',
		lineItems: [],

		{% comment %} Properties that aren't present until purchase {% endcomment %}
		orderNumber: '{{ checkout.order_number }}',
		totalTax: '{{ checkout.tax_price | money_without_currency }}',
		totalShipping: '{{ checkout.shipping_price | money_without_currency }}',
		discountCodes: [],
	};

	{% comment %} Add line items {% endcomment %}
	{% for line_item in checkout.line_items %}
		CHECKOUT_FOR_GTM_INSTRUMENTOR.lineItems.push({
			id: {{ line_item.id | json }},
			quantity: {{ line_item.quantity }},
			variant: {
				id: {{ line_item.variant.id | json }},
				sku: {{ line_item.variant.sku  | json }},
				title: {{ line_item.variant.title  | json }},
				price: '{{ line_item.variant.price | money_without_currency }}',
				compareAtPrice: '{{ line_item.variant.compare_at_price | money_without_currency }}',
				image: {{ line_item.image.src | json }},
				product: {
					id: {{ line_item.product.id | json }},
					title: {{ line_item.product.title | json}},
					handle: {{ line_item.product.handle | json }},
					productType: {{ line_item.product.type | json }},
					vendor: {{ line_item.product.vendor | json }},
				},
			},
		});
	{% endfor %}

	{% comment %} Add discount codes {% endcomment %}
	{% for discount in checkout.discounts_amount %}
		CHECKOUT_FOR_GTM_INSTRUMENTOR.discountCodes.push({
			code: {{ discount.title | json }},
		});
	{% endfor %}
</script>