Sorry it looks like the values are stored in a query string. To get the value, open the success page and open the bindings panel, and click the + button. choose eCart -> Checkout -> Check out from response and choose and select sage pay vsp form. if you expand the check out from response in the binding panels, you can then see all the values that are returned. You can then update your update server behavior to store the values you want to store from the response.