Filling in a W-8BEN-E form


Hello, I have just filled in a W-8BEN-E form to recieve payment from a company based in the USA. I spent days trying to get help filling in this 8 page form, but in the end I followed a blog post on:
I really don’t want to get this wrong, as this will cost me 30% of the money they owe me. Could anyone please help me with this?
Finally I also have to fill another form : Wire direct deposit authorisation agreement for vendors. Could anyone tell me if the vendor number is our company number, or is it something else? Thank you for any help you can give me on this topic.
Best, Hoana

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