Hi @seank.
You can view a demo of the experience here: http://foxystore.webflow.io/products/watch-1 Of course, this is just one example. All Foxy related templates can be completely customized using your own html, css, and javascript.
In the example linked to above, we added a simple header and footer to the checkout and receipt templates in Webflow. At checkout, feel free to input the credit card number 4111111111111111, any future date, and any 3 digit number.
Let us know if you have any questions.
Thanks,
Josh