Web Based Accounting with Customer Logins
Customer logins can be created using the Business-to-business (B2B) system. This is helpful if you'd like customers to be able to log in to view open invoices, make payments, create orders, or request service.
Go to Income -> Customers -> B2B Users to set up customer login accounts.
Vendor accounts can be created under Expenses -> Vendors -> B2B Users. Vendors will be able to view purchase orders, bills, and payments that are linked to them.
More information can be found here.