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If you are looking for an automatic recurring billing system that can handle customer transactions online such as online credit card transaction processing, membership join and login, product orders and subscription renewals, customer information gathering and business intelligence reporting, then you might want to check out Paysimple. I have used them and it was fairly easy to setup email invoicing, ACH processing, and easily incorporate into one of my web pages. Most of the services out there can do these, but what I can tell you is that the customer service at Paysimple is exceptional. They respond to all my inquiries quickly and have been very helpful. Feel free to check out their services at Paysimple.com.