For your information, this news quoted below is not true. Professional Boxing Association of Thailand established World Professional Muaythai Federation, WPMF. PAT is no longer certify WMF since we have WPMF which organization certified all fights shall be arranged following Muaythai regulations as regulated in Muaythai Royal Act B.E. 2542.
Quoted (from “https://en.wikipedia.org/wiki/Muay_Thai”)
“Muay Thai became widespread internationally in the twentieth century, when practitioners defeated notable practitioners of other martial arts. The professional league is governed by The Professional Boxing Association of Thailand (P.A.T) sanctioned by The Sport Authority of Thailand (S.A.T.), and World Muaythai Federation (WMF) overseas.”