Your profile shows you're in Vientiane, so how about going to the website of the thai consulate IN Vientiane Lao, reading the requirements, meet the requirements, make an appt online so you can show up at the gate, get in and apply, pay the 10k baht and wait 3 days to get your passport back ?
Lemme help you
here's the DTV section of the Vientiane Thai consulate website
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