N.Y. U.C.C. 2-a-202

Section 2-A-202. Final Written Expression: Parol or Extrinsic Evidence.\n Terms with respect to which the confirmatory memoranda of the parties\nagree or which are otherwise set forth in a record intended by the\nparties as a final expression of their agreement with respect to such\nterms as are included therein may not be contradicted by evidence of any\nprior agreement or of a contemporaneous oral agreement but may be\nexplained or supplemented:\n (a) by course of dealing or usage of trade or by course of\n performance; and\n (b) by evidence of consistent additional terms unless the court\n finds the record to have been intended also as a complete and\n exclusive statement of the terms of the agreement.\n