I have 3 items in my sales page all redirecting to the same checkout, but I have a script that captures the parameter value and checks the corresponding radiobutton in the product-list module. But the issue is that the order summary and order bump modules are not showing when I have the parameters in the url Imgur: The magic of the Internet. Without those parameters, they’re showing just fine Imgur: The magic of the Internet
Instead of relying on URL parameters (which can sometimes break the order summary/order bump modules), I’d recommend using sessionStorage to pass the selected product/variant across pages.
That way, you don’t need to modify the checkout URL at all — and your modules will continue to load properly.