solo therapists web site

Hello everyone,

I'm opening a web site for solo therapists to join and get the leverage of a large group. Part of the criteria to join would be legitimate credentials as a massage therapist. With so many criteria for all the regions throughout the world. How would you recommend ensuring members that join are properly certified/licenced/registered? Each region has there own designations as well, here in Canada it's registered massage therapist. But other areas it's licenced massage therapist. Any thoughts that can help would be very much appreciated.

Glen Beckel