(a) Scope. This section applies to an issuer of a debit or credit card (card issuer) that is a national bank; a Federal savings association; a Federal branch or agency of a foreign bank; or an operating subsidiary of any of these institutions that is not a functionally regulated subsidiary within the meaning of section 5(c)(5) of the Bank Holding Company Act of 1956, as amended (12 U.S.C. 1844(c)(5)).