Conn. Gen. Stat. § 14-11i: Payment of fees by credit card.

The Commissioner of Motor Vehicles may allow the payment of any fee specified in this chapter or chapter 247 by means of a credit card and shall charge each payor a service fee for any payment made by means of a credit card. The fee shall not exceed any charge by the credit card issuer or by its authorized agent, including any discount rate. Payments by credit card shall be made under such conditions as the commissioner may prescribe, except that the commissioner shall determine the rate or amount of the service fee for any such credit card in accordance with subsection (c) of section 1-1j. Such service fee may be waived by the commissioner for a category of fee if such waiver has been approved by the Secretary of the Office of Policy and Management pursuant to subsection (b) of section 1-1j. If any charge with respect to payment of a fee by means of a credit card is not authorized by such issuer or its authorized agent, the commissioner shall assess the payor the fee specified in subsection (f) of section 14-50.