Why did my contracted business send me a w9 for my new staffing company?

I just started a staffing firm in an llc and it is taking off pretty quickly. Im trying to understand how to setup my payroll efficiently for taxes. I sent my ww-9 to the warehouse company I currently have contracted agents at, they also sent me back one in return for their info? Why would I need their w-9? I... show more I just started a staffing firm in an llc and it is taking off pretty quickly. Im trying to understand how to setup my payroll efficiently for taxes. I sent my ww-9 to the warehouse company I currently have contracted agents at, they also sent me back one in return for their info? Why would I need their w-9? I thought I would only need 1099's for the agents as income as I pay them, why is the company Im sending agents to sending me their w9?
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