Whoa, this looks pretty fantastic to me. Have you thought about integrating with Shopify? It has a lot of trouble with recurring payments, and Chargify is a pain to use and adds an additional $60/month charge on top of the Shopify fees (it is still worth it, but Shopify having simpler recurring payments would be amazing). This looks like exactly what I was looking for about a year ago when I add recurring payments to my store.

EDIT: After signing up, I see integrating with Shopify isn't even necessary. Do you plan to compete with them? Or potentially be a feature to work with them?