I am trying to create a paypal subscription link , when someone singup on my site they will be redirected to paypal and pay for their monthly subscription fee. And when payment success paypal will triger a script in my site that will automatically enable the account of the new member of my site. I tried to search how to do this and many were recommend me to used IPN but I can't find a great tutorial how to do it well, but I can't do trial and error because there is no way in paypal to try if my script is working or not...
Paypal has great information in pdf and forums on how to implement this You can also use the sandbox to test your return IPN.