Can I send a courier for my 90-day check-in report instead of visiting Chaengwattana in person?

There is no rule that you have to go to the immigration office in person to do your 90 day report so you could send it with someone.

Bumrungrad Hospital offers a 90 day reporting service on their 10th floor Customer Service Center where you pay 650 baht leave your passport with them and they go do the 90 day report. Then you pick your passport up a few days later.

Otherwise I'd say google is your friend ;)

Good Luck. (y)

You can do this 90 report by internet, mail or in person. We don't allow pushing paper companies on this page.