Store that sells from multiple sellers (marketplace)

Hi,

I have built a few ubercart sites. Now I am designing one that allows multiple users to create their products. All of the products appear in the same catalog (digital products btw). But when one of them is sold, the amount is registered on the buyer's account and ideally he/she is payed automatically, perhaps when a certain limit is reached or he pressed a "pay now" button.

I don't think this functionality is in ubercart. Is it in ecommerce?

Any tips are welcome!
Thanks