I'm heading to Chiang Mai Immigration on Tuesday, after my "under consideration" period, to get my 1 year extension (Thai wife) inked into my passport. Can anyone please confirm any documentation requirements. I guess passport copy and updated bank book copy as a minimum? Cheers.
Update 27 April 2021... got the stamp today until next year, only passport required, nothing else, in and out in 6 minutes. This was CHIANG MAI immigration.