Within Facebook ads you can include and exclude visitors to specific pages to your website or checkout pages.
General website pages are easy to determine their URL address however checkout and payment pages are not as easy (unless you place a test order).
All checkout pages URL is https://www.beercartel.com.au/cart.php
The final order confirmation page which is only shown once an order is placed is https://www.beercartel.com.au/finishorder.php
Using URLs you can create filters on audiences, e.g. those that visited a product page but did not place an order.