snippets/customify-source.liquid

{% if template contains 'product' %}<script>var product_detail = {id:'{{ product.id }}',handle:'{{ product.handle }}'};window.jQuery || document.write("<script src='//ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js'>\x3C/script>")</script>{{ '//mycustomify.com/js_api/call/yourstore' | script_tag }}{% endif %}

replace yourstore with your store name for sample mystore.shopify.com then replace yourstore with mystore.