How do I obtain a letter of endorsement for an AO visa from the Thailand Board of Investment?

The AO visa application process does not require a letter of endorsement from the Thailand Board of Investment, according to available information. For the medical certificate, it's important to consult a local GP familiar with the necessary requirements. Some users suggest that while local GPs can issue the certificate based on interviews, they might not perform the specific required tests, such as for elephantiasis or syphilis. It's advised to check with your local Thai embassy for the correct application forms and any medical requirements.