I'am a startup looking for a billing platform?
Anyone heard of the SeedEdition? They are giving the first $1M in revenue for free.
Chargify has a really flexible structure for configuring how you bill, with an api that lets you hook into it pretty easily.
The main drawback is, at least the last time I looked at them, the cost structure. It very quickly gets expensive, although depending on how much you charge, it might not be an issue.
You can always roll that cost into your actual offering, as well
http://mcftechnology.wordpress.com/2011/11/14/seed-edition-f...
In other words, he could actually do the charge through stripe, but he couldn't generate the invoice by which he comes to the amount that he charges.
Maybe i'm wrong.