Dear Sir,
We would like to send (your customer name) to visit your country and negotiate cooperate of our company’s goods business with enterprises including (the company you want to visit) within (the day you issue the document) will be staying (how long you want to stay in destination) days.
IF you can approve their VISA should be high appreciate!
The number of passport:
Best wishes!
(General Manager Name)
(Company name)
(Company stamp and signature)