Reoccuring billing systems for SaaS
http://blog.recurly.com/2009/08/how-many-companies-does-it-take-to-process-a-credit-card/
https://cheddargetter.com/
http://chargify.com/
http://recurly.com/
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http://blog.recurly.com/2009/08/how-many-companies-does-it-take-to-process-a-credit-card/
https://cheddargetter.com/
http://chargify.com/
http://recurly.com/