We are currently in private beta test of a HikaShop Facebook Pixel plugin my company wrote that dynamically handles this.
Our plugin inserts the FB pixel in the right pages, records user events like add to cart, begin checkout, completed checkout conversions and even supports Facebook advanced matching of user data. Additionally it sends the catalog information like product SKU to Facebook so you can use remarketing product display ads.
I'm not in the position to provide the plugin yet outside our private beta testing, and to be candid, I'm not sure if we will make it available to the general public or keep it exclusively for our retainer clients. However, if you would like to learn more, please get in touch and let's talk about it. You can open a ticket with us here:
PolishedGeek.com/clients/contact.php
Regards,
~ Deb