Hi :) got my approval via Phnom Penh embassy in person, no agency needed. It was super easy just a longer waiting time 8days. Soft power activitys: bank statement in English, passport, visa form, photo, for soft activities for muay Thai: the bill and the confirmation of the booking of the class for 3 month. Be sure that it is a official muay Thai school and not just a muay Thai gym. Fee: 400$. Feel free to ask :)