I have a subscription for a wake up call service, that once they pay for the product, i want it to direct them to an external page that will allow them configure their wake up call info. This page is not on our site but rather, on the wake up call service site... They are telling me that as long as we pass the user ID ( username ) along, that the wake up call set up page will recognize their acct, and allow them to configure their unique wake up parameters. How do I send this username to the wake up call service page? Can someone please tell me how to do this?