How to accept recurring payments in a subscription site?

[eluser]bretticus[/eluser]
Often, reoccurring payments can be handled by the payment gateway provider directly. What you ask (a CI library for payments) is such a narrow field of development that it's not really a CI issue at all. CI is a framework for generic development. That is probably why nobody answered this post before me. You might have more success looking in forums that deal with payments such as oscommerce or zencart.