300250 Paypal IPN/ subscriptions

Hi There, I have a site where the current registration page is situated within the main page of the site......The site is not fully build yet but ideally we'd like the reg process moved to the front of the site (we need to build a few more pages in before this explaining how the site works etc...)...Then I would like a Paypal subscription set up ie Register here for X days membership.....person pays...and can now log -in and use rest of the site for duration of membership subscription(membership details added to database)....As well as an 'existing member' log-in' also on the page. The site is selling stuff and although Paypal IPN is integrated in the site it isn't working properly....I think it is just a wrong path name or something like that (script doesn't respond when tested). I need this fixed. There are also a few other little tweaks needing done (basically taking a few options and text out, or editing existing text). I need the above done quickly but working well, You should be able to start this either within the next 24 hours (we are in the UK). thanks for your time !!!