Looking For Paypal / Payza Clone

Hi,
Title says it all ..
I'm thinking about a payment gateway processor for specefic countries ..
Will have to deal with legal issues of course,
But for now, I'm looking for a framework, a good script that I can start from ..
I looked a bit and I didn't find anything other than
http://www.alstrasoft.com/epay_enterprise.htm
What are your thoughts ? do you have any other scripts in mind ?
Thank you

See original post by Toon-c