What documents and fees are required to extend a 45-day Thai visa for an additional 30 days?

To extend a current 45-day visa in Thailand for another 30 days, you will need to provide several documents along with the 1,900 baht fee. The required documents include a completed TM7 application form (which can be obtained at the local immigration office), a signed copy of your passport's photo page, a signed copy of your entry stamp, one passport-sized photo, and potentially a filed TM30 form, which serves as proof of your address and is usually completed by the hotel where you are staying.