@David-Healey says it well; you might have a working checkout with WooCommerce or Paddle or FastSpring or whatever, but it's the "other stuff" we specialize in. Eliminating the glue code of connecting purchase history with your newsletter subscribers, offering upgrade pricing and exclusive discounts, so many things you need to scale your sales.
And according to our merchants who move to us from Gumroad, we've been more stable than Gumroad has, but better check with our merchants to verify that fact. Happy to give anyone a demo with no strings attached, just book a slot: https://cal.com/moonbase/introduction
Anyways, sorry for hijacking the thread, this is about meta ads, not us, here's how we track conversions through our embedded storefront: https://moonbase.sh/articles/adding-meta-pixel-support-to-the-embedded-storefront/