You will get an overstay stamp in your passport after you paid the fine. If you come back the same day or even within a few days the immigration officer might give you a hard time.
lmao this guy is like 50 and doesn’t know the difference between UK English and US English. Typical American 🤣 English isn’t my first or second language and even I know the difference between traditional and simplified English. I feel sorry for you haha.
They don’t put anything in your passport (anymore). I think it changed around covid times. Just bring your passport and printed visa to the immigration officer and they will stamp your passport once in Thailand.