I am trying to get my Paypal subscription to redirect to a custom page after a successful checkout.

Before submitting to Paypal I overload the submit handler, run my own function (to store details) and return a unique id. I want to attach that id to my return URL. (as a GET or POST var so to speak)

I have turned auto redirect "on" in my Paypal sandbox sellers preferences, but it only seems to re-direct to the URL that I HAVE to put in there.

using the <input type="hidden" name="return" value="someurl" /> does no seem to work.

I want it this way so that I can capture the user information when entered with a "non-paid" flag, then via the IPN I can update that record with a "PAID" flag, and I want to use the unique ID to tie it all together so to speak.

Any advice or a different approach is welcomed.

Many thanks!