search for: vspserverpaymentpag

I have an application which is to talk to the protx VSP server system. In order for it to work I need to redirect to a url which looks like the following : https://ukvpstest.protx.com/VSPSimulator/VSPServerPaymentPage.asp?TransactionID={88F1532E3-17E8-410A-A688-1E1ABCDDD50} (the above is not a valid transaction id just an example) this is stored in a variable called next_url so when I call redirect_to(next_url) the system does not redirect me.... I get a blank page instead. if I remove the curly brackets bit...