What documents are needed for a Covid extension at MHS office in Pai, Thailand?

A user received a Covid extension for 60 days at the MHS office in Pai, Thailand, with a USA passport. They needed to present an email print-out from the US embassy indicating they do not provide letters regarding visa matters, along with a fee of 1900 baht for the extension. Despite prior discussions about a higher fee of 3000 baht, the user also mentioned receiving an initial stamp and being asked about their exit strategy.