I have retirement visa and this time I did not renew my “exit/reentry “ part because I was told that it can easily be done at the airport. Now I’m about to travel out and return in a few months - please can you tell me WHERE in suvarnabhmui bkk I apply and pay for this (at immigration desk with the officer, or before?) and if this service is open 24 hrs - I fly out at midnight

Thank you for your help!