Behind The Checkout - Example of email-based Shopify Order Confirmation gating

shopify-order-confirmation-script-gate.html

{% if first_time_accessed or email == 'james@yourdomain.com' %}

<!-- 
	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 %}