Pro Sites: Auto invoice as PDF possible?

Hi, i´m planning to use the plugin Pro Sites for subscriptions. I need to invoice my members, best way would be an automatic process with PDF files sending by email. Is there are good solution to get this running with Pro Sites? Or is something like this planned for the Pro Sites plugin? If yes, is there an release date? Because i´m from Germany, I also need the invoices with correct VAT ID logic. Would be nice if there is something that would have all these features. Thanks, Sascha