Vendor registration is free. Vendors must have the appropriate insurance in order to be awarded a County contract.Form 3921 must be submitted along with the 3 supporting documents described in part 1 of this presentation as a single application package. All applicants are required to submit a completed and signed IRS form W‐9, proof of active status from SUNBIZ and the latest county business tax receipt. Miami-Dade Vendor Affidavits Form; Authorization Agreement for Direct Deposit (MUST SUBMIT ORIGINAL DOCUMENT); Owner Consent (if applicable). A public agency or a contractor or subcontractor may not enter into a contract unless each party to the contract registers with and uses the E-Verify system". Interested parties should submit a completed Vendor Application Form (rev. This Agreement shall be governed by, and construed in accordance with the laws of the State of Florida.