This agreement outlines the terms and conditions of the vendor's services, including payment terms, any warranties, and other important details. We'll help you craft the best vendor contract agreement for your specific needs, and help you manage that relationship as long as you need it.To determine if you need a license, contact your local Clerk of the Circuit Court or call the State License Bureau at 410-260-6240. All retail vendors are required to register and collect the. Maryland sales and use tax and obtain a sales and use tax license. In order to fill out the Local Business Initiative Certification Application, or to search our database of certified vendors please click here . This. Affidavit must be provided within five (5) business days of notification of proposed Contract award. Once complete, eMMA checks to make sure no existing Vendor registrations match your profile in the system.