@Terry *******
no of course they can't "sort this at the exit" ๐ it was HIS fault that he didn't check his passport ๐
He's gonna hafta stamp OUT of thailand on his visa exempt entry <- which is what he's on here right now and then stamp IN and out of Cambodia (by buying a cambodian visa on arrival) and then he will enter thailand and SHOW them the visa sticker in his passport so he gets 90 days