Thanks for your prompt response to my inquiry. If I may ask,How do I go about authenticating my Certificate of Incorporation with the Chinese Consulate in Lagos?
I am asking because i was at the Chinese Consulate in Lagos to authenticate my Certificate of Incorporation but was directed by the Security guard at the consulate office,to first go to Nigeria foreign ministry office in Abuja to authenticate before bringing it back to Chinese consulate for final authentication.

However, I am not sure if the security guard know what they are talking about.
My question is this,

1.Am I to go to Nigeria Foreign Ministry or Corporate Affairs office to Authenticate my Certificate of Incorporation before bringing it back to Chinese Consulate in Lagos for final authentication? Is that the procedure?If yes,apart from Chinese Consulate, which of the two Government agencies should authenticate my certificate of Incorporation?

2.How long does the Invitation Letter takes to be approved by the Foreign Affairs Office or Economic and Trade Bureau in China

3.If i obtained my Invitation Letter,how long does it take to book an appointment and interview before issuance of Visa? I want to be cleared in order to plan my trip properly.

Your quick answers to all my questions would highly be appreciated.
Regards,
Oyeeze.