I am not looking really for code. Just any reference, forum or resource that is looking for/or have found a way to create direct links that will change the order in the cart directly to another product.
To clarify, A customer may already have one product in their cart, and is in the checkout page. I want a direct link there, that can direct him/her to change the order to another product and redirect directly to the checkout page of that new product without the old product in the cart.
I have been using google to search for a few hours now, and I can't find a specific reference that relates to this so far. Just wanted to see if anyone else has encountered anything like this, or is dealing with the same problem.