First off welcome to the community @Piasecki
What you need to know is that FoxyCart isnt a Payment Gateway or processor. They offer a variety of payment processors, which you can find a full list here: Payment Methods | Foxy.io
Next, they integrate seamlessly with Webflow if you need a processor other than Stripe or PayPal and additional integration features that are not yet available within Webflow.
Also, there is a bit more setup/configuration that is needed when working with Foxy but it is a great alternative to the native eCommerce solution.
@foxy Josh you have anything else to add?
Please let me know if you have any other questions,
~ Happy Designing ~
Brandon