Upon acceptance by the creditor, full performance extinguishes an obligation if done by the party whose duty it is to perform it or by any other person on that party's behalf and with that party's assent.
N.D. Cent. Code § 9-12-01
Extinction by full performance
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.