Just a follow-up on my overstayed. I was able to pay my fine just inside of the security check in. Immigration officer was very friendly and helpful. Paperwork took about 20 minutes, but there was no line in front of or behind me.
Sorry for the delay...I had no FB access for the duration of my trip.
TLDR : Answer Summary
The user shared their experience of paying an overstay fine at a Thai immigration checkpoint, noting that the officer was friendly and the process took about 20 minutes with no wait time involved. They mentioned having previously been unable to access Facebook during their trip. Comments from others asked for specifics about the fine amount and where the payment was made.