Simple Memberships - do not create invoices or billing for a client-- it acts to simply label the client as a member. It is commonly used for facilities that do not tracking process billing for memberships through EZFacility-- or for facilities that offer free memberships and still want to track who is or is not a member.
For more information on how to set up a Simple Membership please click on the following link - Simple Memberships
Advanced Memberships - are sold directly to a client and are typically tiered-- i.e. gold, silver, bronze, etc --and are normally accompanied by a time frame-- M2M, 3 months, 6 months etc. These memberships do create invoices and can have payments taken through EZFacility via a merchant gateway with a facility's merchant processor.
For more information on Advanced Memberships please click the following link - Advanced Memberships