Multisite user dashboard

Hi. I was wondering if you could help me with this issue I have designing my multisite network.
I have the following project with the following structure: store.domain.com (multivendor capable), directorylisting.domain.com. By default, an user that registers to my site, should be able to make purchases from store or submit a quote from the listed directory offers. I do however have an issue with a central dashboard where based on the activity of the subscriber both activities from the store and directory can be shown. Same for the store, considering the activity of the subscriber becoming a multivendor, or say becoming a customer requesting a quote for a directory listing. I would appreciate the support, if anyone has an idea what plugins to use. Thanks.