I did mine Laos Vientiane about a month ago be prepared to spend at least 5 days there as you have to relinquish your passport for processing mine was put in Monday morning and had to wait till late Thursday to get it back I had to supply up to date bank details for the last 3 months statements from my home country of residence I used an agent from Vientiane to do all for me he is very knowledgeable and helpful with the process he can meet you at the Laos side of the Nong Khia friendship bridge I can pm his number and messenger address if you want, cheers