I built a recurring billing system on top of Amazon FPS and it was anything but easy, especially once the credit cards started expiring. I wrote a little about

I built a recurring billing system on top of Amazon FPS and it was anything but easy, especially once the credit cards started expiring. I wrote a little about it here: http://peachshake.com/2010/06/15/saas-subscription-billing-or-how-to-avoid-getting-your-nts-in-a-vice/ http://peachshake.com/2010/06/15/saas-subscription-billing-o... And then the move to Stripe here: http://agileleague.com/2012/07/migrating-away-from-authorize-net-and-chargify-part-1-comparing-the-alternatives/ http://agileleague.com/2012/07/migrating-away-from-authorize...