I am trying to intigrate an IPN solution for my website. However I do not fully understand how it works. I have been trying to use the IPNX solution from Perlsources.com. but it always fails. If anyone has experience using this or any other IPN solution please give me some ideas. I keep getting
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
I am sure it's something simple. Please let me know.