Hi Darryl
In Membership Pro, each member can have an unique Membership ID. However, it is an auto increment number. The prefix can be configurable, however, that prefix will be the same for all plans.
So :
1. The length of the membership id is configurable.
2. The prefix can be configurable but it is the same for all plans.
Hope it is clear to you .
Regards,
Ossolution Team