Don’t need proof of stay. Better off bringing Thai lease and tm30 if you have that. But don’t think they require those either. Muay Thai can be finicky a lot of gyms don’t have correct license. Even old established ones. Easiest cheapest route is medical appointments.
What were the soft power docs? They just denied my Muay Thai app today because my gym Rithrit (which another guy in here used recently) doesn’t have the specific license they’re looking for. To say I’m pissed is an understatement.