I have created a full featured Python package to accept payments in Internet (currently supports PayPal). It has especially great support for recurring payments. Here it is: http://freesoft.portonvictor.org/django-debits.xml I hope we with community work will turn it into an universal payment gateway for many different payment processors. Buy the commercial version and support scientific research and a new principle of the Web I am working on. I hope you don't take this message as spam. Is it OK to post updates of our software to this mailing list in the future?