AutoRenewals - Ecommerce

What's the difference between MarketPress and MarketPress Lite?

I am setting up a site with only one product -- subscription to information -- at three intervals (similar to WPMU); i.e., monthly, every three months, or annually ... with autorenewal just like WPMU.

Does MarketPress or MarketPress Lite have

(a) take care of autorenewals?
(b) link to a third-party shopping cart?