Okla. Stat. tit. 12A, § 2-512
Oklahoma Code Comment
The buyer has the right of inspection of the goods before payment unless the contract or shipping terms are to the contrary, or if inspection is not feasible. See discussion under Section 2- 310 . See also Section 2-513. Goods shipped C.O.D. or cash against documents are not subject to inspection. Thus, the buyer is required to make payment, even though the goods are non-conforming, with the two stated exceptions. However, payment does not impair the buyer's right to inspect or preclude him from any remedies. Previous Oklahoma decisions are probably in accord. Wallace v. L. D. Clark & Son, 74 Okl. 208, 174 P. 557, 21 A.L.R. 361; White v. Oliver, 32 Okl. 479, 122 P. 156 (1912), both hold that payment does not preclude the buyer's remedies upon discovery of the breach.