N.C. Gen. Stat. § 25-2A-202: Final expression: parol or extrinsic evidence.

Terms with respect to which the confirmatory memoranda of the parties agree or which are otherwise set forth in a record intended by the parties as a final expression of their agreement with respect to the terms included in it shall not be contradicted by evidence of any prior agreement or of a contemporaneous oral agreement but may be explained or supplemented by the following:

(1) By course of dealing or usage of trade or by course of performance.

(2) By evidence of consistent additional terms unless the court finds the record to have been intended also as a complete and exclusive statement of the terms of the agreement. (1993, c. 463, s. 1; 2025-25, s. 125.)