What is the process for obtaining a 30-day extension of stay at the Immigration Center in Chiang Mai?

A recent experience at the Immigration Center in Chiang Mai detailed a smooth process for obtaining a 30-day extension of stay. Arriving at 11:30 AM, the author received their extension 90 minutes later with necessary documents including the application form, passport copies, TM6, and a fee of 1,900 THB. Notably, no TM30 or onward tickets were required, and no proof of cash was needed, creating a friendly and efficient atmosphere.