I. Conducting business (not including employment), the visa applicant must include with his or her visa application any such documentation the Consulate deems necessary for consideration of the visa application which includes the following:
An original employment verification letter with the purpose of visit.
An original letter of invitation on company letterhead from the business host in Thailand;
A copy of the host's Registration of Trade which states the amount of capital investment which is issued by the Department of Commercial Registration with certification by the Department not more than six months earlier;
Certified documentation of the payment of taxes by the business host of the past two years.
Certified approval Letter from the Labor Department by the Department of Consul, Ministry of Foreign Affairs, Thailand.
Any documents that prove you are traveling for business purposes;