Where the contract requires payment before inspection nonconformity of the goods does not excuse the buyer from so making payment unless The nonconformity appears without inspection; or Despite tender of the required documents the circumstances would justify injunction against honor under the provisions of Titles 1 through 10 of this article (§ 5-109(b)). Payment pursuant to subsection (1) does not constitute an acceptance of goods or impair the buyer’s right to inspect or any of his remedies.