I am arriving from USA with USA Passport on 30 Sept and planning to return on 14 Nov. I have a plane ticket for those dates. Do I need ANY PAPERWORK or have to do anything special at the AP or at immigration in Pattaya or at the AP to extent my stay from 30 to 60 days - or does the AP check-in by immigration from the flight check me in from the 30 Sept to 14 Nov without any other action by me???????