S.C. Code Ann. § 33-49-1320: Designation of Secretary of State as agent to accept service of process.

Any such foreign corporation, as a prerequisite to the extension of its lines into and the transaction of business in this State, shall by an instrument executed and acknowledged in its behalf by its president or vice-president under its corporate seal attested by its secretary designate the Secretary of State its agent to accept service of process in its behalf.