they're certified.theyll write you out a receipt for one years Muay Thai ,but can do whenever want,they helped me get mine in Vietnam a week ago.id much rather be in cm than bkk .
Most will tell you to be very careful about buying anything , might want to chat with a thai lawyer, much cheaper to pay a little beforehand than a lot after. Many will tell you to rent, it's cheaper easier in the long run, if something goes sideways not so much loss. I'm retiring here on and off, won't be buying anything.
I checked online twice a day,it eventually showed granted at 10 p.m. on a sunday.tgey will email your visa.not sure if they'll email you need to send them more info.i did mine in Hanoi,took 6 days