I have designed a custom shopping cart, and working fine.
Have set up a paypal sandbox account .
The main problem is it is running on a Windows Server 2008 IIS.
PHP [url removed, login to view] is installed
curl is running according to phpinfo.
The Issue is the curl 60 errror in the log file and the Success script not being run.
If you have experience in these issues I would like to work with you for a couple of hours to overcome.