Behind The Checkout - Verifying Liquid tags on the Shopify Order Confirmation page (using an existing customer order)

verifying-order-confirmation-liquid-tags.html

{% if first_time_accessed %} 
<!-- Scripts you only want to run on first checkout confirmation -->

<!-- The tracking pixel that we want to verify is outputting the correct information -->
<img src="https://www.tracking.com/pixel.gif?amount={{ total_price | money_without_currency }}&amp;order-id={{ order_number }}&amp;currency={{ currency }}" height="1" width="1" />


{% else %}
<!-- Scripts you want to run on every visit to confirmation page -->

<!-- 
	Put the liquid tags that you want to verify in a div with a unique ID and display:none CSS rule 
-->
<div id="search-for-me" style="display:none;">
	{{ order_number }}
	{{ total_price | money_without_currency }}
</div>


{% endif %}