Please complete all fields and be prepared to upload required documents. There is NO fee to apply for a certificate of registration in North Carolina.The department does not contract this service out to third parties. A marketplace facilitator engaged in business in North Carolina is required to collect and remit sales tax on behalf of all its marketplace sellers. To become a vendor please complete the online vendor application using DocuSign. Contact with a Cary representative is required to complete the application. In the State of North Carolina, with its principal place of business at. ("Vendor"). Please complete all areas of the form including any Historically Underutilized Business (HUB) information. â–« Required Vendor Forms. Vendors must complete the following forms: WIC Vendor Agreement (DHHS 2768).