> Managing recurring billing is a significant engineering problem This is a huge understatement! Its very painful. It sounds easy, but there are so many end ca

> Managing recurring billing is a significant engineering problem This is a huge understatement! Its very painful. It sounds easy, but there are so many end cases with the calendar alone! Let along discounts, prorating, cancelations, etc. It sucks to become dependent on providers for this service, but it also sucks to have crappy recurring billing.