Documents Needed for Z-VISA

Hi there,
I am applying for the Z-type through my company.I have received the invitation letters,employment license from the bureau.I was informed it will take only 4-5 working days to get the Z-type.I am applying through a third party vendor(since my company has a contract with them) .The third party vendor has requested many additional documents such as "Police clearance certificate","Original Last six months bank statement with Banker’s Seal and Signature","Hotel confirmation","Forex endorsement on the passport ".However in the embassy website I did not see such documents.Are these documents necessary?? If I don't submit these documents will my application be rejected?

Regards,
annad