The person who is refused the issuance or renewal of a certificate or whose certificate is suspended or revoked under subsection (a) shall be afforded an opportunity for agency hearing, upon request made within thirty days after the date of issuance of the notice of the refusal, suspension, or revocation. In such hearing, all issues shall be determined on the record pursuant to
section 554 of title 5. If no hearing is requested as herein provided, the refusal, suspension, or revocation shall constitute a final and unappealable order.