Snipcart custom Thank you page

Hey there,
For a project I’m working on I need a bank transfer option and decided to go with Snipcart for this. However I’m stuck at customizing the thank you page after an order has been made. I’ve used this article: Customizing Your E-Commerce Thank You Page - Snipcart but after including the code in the Custom code section in Webflow, nothing really happens and only the default Thank you page appears. Any advise on this will be super helpful!