If you have a CVS in your area check to see if they are doing the rapid test at the top of the page if it will say regular or rapid and if you can find a CVS that does at 12:01 midnight go to cvs.com and click on their covid-19 testing page and book it don't wait till the next morning because all of the test appointments will be gone
it was the 1st time we had ever extended and just listened to the the embassy lessons learned.. we are making our 9th trip in 10 years this Sunday and have learned lots over the years..
yes we had to pay 15,000 baht each in cash at the airport, they let us leave came back the next day with cash $300 each for airline change.. This was right after the government takeover, the embassy told us the visa was good for 90 upon entering the country then immigration said nope pay up..