I am more of a Symfony developer, but I have to admit that this project is pretty cool.
Spark is a Laravel package that provides scaffolding for subscription billing, invoices, user management etc.
It is a great starting point for most of the projects out there.
Spark has two plans $99 per Site or $299 for unlimited sites and extensive documentation
I have looked at some demos and videos and it seems to be a very promising project, the next step is obvious, give it a try.
Stay tuned for a step to step guide. Meanwhile check the spark project site for more info.