Before the contract is awarded, the selected vendor must submit a subcontractor utilization plan in the county's Contract Compliance System. Explore the Hennepin County supplier portal to view solicitations and submit online bids for commodities and biddable services.The vendor overview is a general guide to assist new or returning vendors learn how to navigate the vendor registration process. Issue to a vendor or protective payee if the client completes the Request for Voluntary Vendor Payment (DHS2984) (PDF) form. â—‹. Looking for solicitations for goods, services and contracts? State bid invitations and requests for proposals are posted here.