33 C.F.R. § 138.120
(a) Fee payment methods. Each COFR Operator applying for a COFR, or requesting a COFR renewal, must pay the fees required by paragraphs (b) and (c) of this section as follows:
(3) For COFR Operators submitting Applications and requests for COFR renewal under § 138.60(c)(1)(ii) through (iv) (email, fax, and mail submissions), the fees must be paid by a check, cashier's check, draft, or postal money order, made payable to the “U.S. Coast Guard”. Cash payments will not be accepted.
(b) Application fee.
(2) An Application fee is not required when the COFR Operator submits—
(c) Certification fees. In addition to the Application fees required by paragraph (b) of this section, each COFR Operator who submits an Application or request for COFR renewal must pay the following certification fees:
(d) Fee refunds.