Session variables should be available from all pages as well as shopping cart information. It should aready be in the bindings. You should not have to apply any server behaviors on this page.
Payer profile is often used to populate the checkout form. The checkout form submits to the confirm page and stores all of those values as session variables. Those session varialbles populate a hidden form that is used for the final transaction. In express checkout those fields are stored on the pp_confirm page from the payer profile passed back from paypal, but they are still stored as session variables. You should be able to refer to them directly on the success page.