Send Invoices to sellers on multisite

So we are thinking about a workaround for the global cart without supported chained payments.

And here is a question:

Do you know of a good way / an existing plugin (or a plugin that is closest to what’s needed ) to send multisite sellers system generated invoices for products sold on Multisite Marketpress from the main store owner?

In some sort it’s a subscription type model for a multisite, with a difference that sellers will get monthly invoices based on the total amount sold, which they’ll have to pay to the main store owner by paypal or any other available method.