For the drive-thru 90 day reporting in Chiang Mai, you primarily need your passport and a current TM30 form. If this isn't your first report, you can also opt for the quick online reporting option which takes about 30 seconds to complete.
90 DAY REPORTING RESOURCES / SERVICES
Use the trusted Thailand 90 Day Reporting Service to get your in-person report done and mailed to you for as low as 375 THB (even if the online system doesn't work for you).
For immediate assistance, contact Thai Visa Centre directly via LINE at @ThaiVisaCentre or Email them.