What documents do I need for my first 30-day extension on a METV in Bangkok?

The user is seeking advice on obtaining their first 30-day extension for a Multiple Entry Tourist Visa (METV) in Bangkok. They are unsure of the necessary documents and procedures. Community comments provide information including required documents such as copies of the passport data page, tourist visa, entry stamp, TM.6 departure card, a filled-out TM.7 application, a passport-sized photo, and a fee of 1900 baht. It also includes a link to the official Bangkok Immigration site for additional guidance.