Add Facebook event on Form submission

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We have a facebook pixel running on Shopify. I want to fire a Complete Registration event when someone submits an email address. I've written off to the maker of the app Form builder with file upload to see if I can use a facebook event with its form.  But am I missing a trick? Is this something that should be done by coding in liquid in some way? (I haven't done this before but am happy to give it a go.)