Hi,
I'm planning on building a drupal-based webapp with customizable monthly billing plans. In short, there will be something like 4 main packages with different amounts of allowed users, storage space, additional features, etc - all costing different amounts. I also intend on including upgrades and downgrades for each plan to offer additional flexibility - which varies the price.
Problem is, the two leading ecommerce solutions for drupal are Ubercart, and e-Commerce - both which completely suck (at least for this scenario). Being that the main app will be drupal-based, I intended on hosting subdomain copies of it for each client. If that is the case, I can have my main site running something else. So my question is, what sort of (hopefully open-source) systems are out there that can handle and manage this type of billing system (the type of system that the other half a million companies are using, etc).
Thanks
A few other people seem to as well [see 1]. My main site is GWT, so has the same Main-Site/Subscription Handling divide you seem to favour.
Satchmo & Django are nicely architected, so it is as easy to extend/modify as anything could be.
See :: Features -> Subscription Based Products[2]
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[1] http://www.satchmoproject.com/
[2]http://www.satchmoproject.com/docs/svn/features.html