S.D. Codified Laws § 5-9-26
Reinstatement of contract on compliance by purchaser with conditions of notice
If within the time mentioned in the notice, the person served complies with such conditions and pays the cost of service, the contract shall be thereby reinstated to the same effect as though no default had occurred, but otherwise shall terminate as provided in § 5-9-23 .
Source: SL 1919, ch 306, § 3; SL 1929, ch 221; SDC 1939, § 15.0309.