hello dear , i have jus invitation letter , but i ask about visa notification

hello
embassy hey ask me about visa notification , i hold lebanese passport , i live in australia and i am residence there, but they ask me about visa notification , my supplier in china he give me just invitition letter, but embay they need the notification ,and they cant make that ,bcz they dont know , if u send to me some number calls in china , and i contact them thank u