You have to apply directly to the Immigration Department of the Hong Kong Special Administrative Region (HKSAR)with these required documents are: HK Visit/Transit Visa Application Form (ID1003A and ID1003B which can be download from www.immd.gov.hk.), one recent passport-photo size color photograph of the applicant, one photocopy of the passport page containing the personal particulars, proof of the applicant's financial standing (e.g. bank statements, salary certificate issued by the company), invitation letter from the HK comany, air tickets booking, travel itinerary.