I've got a site where I'd like each order to contain just one product/item. Therefore, I want to bypass the step of adding an item to a cart, and being able to keep adding items to the cart (the reason I want to skip this is because I don't want the user to end up with more than one item in the cart when they go to the checkout).
I just want to take the user straight from a 'Buy Now' button to the checkout page, where they enter their payment details and complete the order. How would I go about doing this with CartThrob?
My usual workflow would be to use the Add to Cart form, then from there, go to the checkout page. I'm a bit unsure on how to cut out this 'Add to Cart' step in the middle though - I've tried using the checkout form with my 'Buy now' button, but I just get a message saying my cart is empty so I'm obviously going about this the wrong way.