invite letter yes but the personal letter from the board of Boxing sports takes ages. We dint bother with it now and most embasdys dont ask for it if you bombard them with certification. But yea in theory there is a system in place where the board of Boxing sport writes individual letters.
Its fine. They only need proof you are enrolled on a course The course itself is unmonitored. They want to encourage travel within the kingdom and you are not tied down to study like the Ed visa. Come and go as you please
Both Japanese embassys have a habit of issuing Ed visa instead of DTV. This is really problematic as most DTV institutions are not licensed by the education ministry. An education visa linked to a school that is not a licensed school by the ministry of Education is useless and could actually put the applicant in a difficult position legally. It definitely can't be extended so its only valid ( well kind of valud) three months.
Chiang mai immigration have appointed a DTV officer. His job description, it seems, was to come up with ways to never extend the DTV at Chiang Mai immigration 555
We have a dirt cheap DTV plus option for our customers who want peace of mind. Proof of ongoing muay thai gym membership which immigration can scan to get to the members page on our website . But the general consensus is its not required..... yet