A business letter of responsibility is required, to be typewritten on your company letterhead and addressed to:
Consulate General of Thailand, Visa Section, New York, NY
The letter must explain all of the following:
Nature of business to be performed
Name and address of reference to be visited
This letter should request Multiple Entries visa if required
If Multiple Entries is required you must state dates of this trip
and dates of second intended trip. (Estimate of dates is ok)
Guarantee of return transportation and sufficient funds for the visit
The letter should be signed by an officer of the company other than the applicant.