@Alan ******
my contract was already signed. I did not sign it again.
You fill out a document that explains exactly why you need your contract notarising. You then ‘swear’ that the contents of the explanation are true in front of the notarising officer. The officer then signs/seals it stating that, to the best of their knowledge, the contents within are true.
Not a ‘true’ notarisation but still accepted as such by the Thai embassy. They just want to see a stamp as a formality, but they don’t read into it beyond that.