Hello, I am attempting to create a Multi-Vendor Market place using MU and Marketpress. Rather than take commissions I would prefer to just charge Vendors a Monthly Membership Fee. I was trying to use the Membership2Pro plugin but it does not offer an option or "Type" to charge Vendors a fee and one that allows customers and affiliates free membership. With no User roles to assign paid or unpaid access, I am struggling with the Types that have been provided, i.e., Standard, Dripped, Guest and Default. How can this be accomplished using this plugin?