What website should I use for 90-day reporting with a 1-year extension in Thailand?

For 90-day reporting associated with a 1-year extension in Thailand, you can use the THIM app or the TDAC website to submit your report. The THIM app has been effective for months and allows for easy submission of the TDAC, while the old website is also available if preferred. Users suggest completing the report shortly before or upon arrival in Thailand, and the app typically provides a QR code within 72 hours after you update your health questions.