What documents are required for a 30-day extension after entering Thailand on a visa exemption?

To apply for a 30-day extension in Bangkok after entering Thailand on a visa-exempt status, you need to provide the following documents: your passport, a copy of the page with your last entry stamp, the TM30 form or a receipt from your accommodation, and a completed TM7 form. Additionally, you will need to pay a fee of 1900 baht in cash and provide a passport-sized photo. Please note that there is an extra charge of 500 baht per day for any overstay beyond the initial entry period.