What is the procedure for paying the overstay fine in Thailand before leaving the country?

Better go to immigration Chang Wattana ask for visa extension. They will give you 7 days extension with a fee of 1900 baht.

Paying overstay also works but might affect for visa in future when you come again to Thailand.

Yea 1900 baht would be better than 500 baht a day

If you are on an overstay already, disregard the following.

If you plan on staying longer than your extension allows, you could apply for one more extension at your corresponding immigration office with the intention of purposely getting denied. Once it's denied, immigration will give you 1 week to leave the country. It costs the same as a successful extension.

Many people do it and immigration understands this trick too. As long as they get money, they'll gladly do this in your favor.

The 1900 baht fee is cheaper than the 500฿ × 7 days = 3,500฿ of overstay.

Not to mention risking getting deported if found before you exit.

Who makes the problem...kids again

They will

Guide you.

After you pass immigration you’ll see the overstay counter. The immigration officer will point you in the right direction.

I wouldn’t recommend you do overstay, it could go against you in the future. Not just Thailand but other countries as well.

You could go and get the 7 day denial stamp at immigration. It does cost the same, 1900 baht. But you won’t have an overstay stamp in your passport.

Don't worry - you will be shown exactly where to pay!

Just get in line for passport control and when they see you have an overstay they'll direct you to the relevant office. Make sure you have the baht in cash to pay.

Yes