Your Shop console has an inbuilt Facebook tracking pixel which can easily embed code.
Follow this guide here to implement it to your shop.
Below is what it covers in Facebook Ad Manager.
// Search - Added to search results page
// AddToCart - Added to Product page, tracks in the same place google analytics add to cart function works from
// InitiateCheckout - When person lands on checkout page
// Purchase - Added to confirmation page
This will assist in creating audiences and remarket to them.