The confirm page forwards to the checkout_success or checkout_failure based on the response sent back from PayPal.
To check the variables sent back from PayPal, you could go into the bindings panel and add the bindings to the page from there.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.