• Client's past invoices from Zoho Books, see remaining balance on invoice, pay with credit card (already configured in Zoho books)
• Client can upload their multi-media assets (this could be tied into my dropbox or another storage program)
• Submit support ticket (could be linked to Facebook chat)
• See available product upgrades and request account manager to contact them
• See available promotions
• See news and updates 
• Written instructions for each client 

Please let me know if this is something you can build. Thanks!