[james_s_tayler]

There are definitely a few moves you can make which avoid massive amounts of complexity if you're willing to accept a small downside. Another one is not allowing billing cycles to go past the 28th of the month thus making renewal logic simpler. Another thing would probably be just bill only in one currency (say USD).

Can you think of any other small things like that that help you massively reduce complexity? I think in the beginning it seriously makes sense to go with the simplest billing possible for as long as you can.