“If, on their face, the documents presented to the confirming bank by the seller conform with the requirements of the credit as notified to him by the confirming bank, that bank is under a contractual obligation to the seller to honour the credit, notwithstanding that the bank has knowledge that the seller at the time of presentation of the conforming documents is alleged by the buyer to have, and in fact has already, committed a breach of his contract with the buyer for the sale of the goods to which the documents appear on their face to relate, that would have entitled the buyer to treat the contract of sale as rescinded and to reject the goods and refuse to pay the seller the purchase price. The whole commercial purpose for which the system of confirmed irrevocable documentary credits has been developed in international trade is to give to the seller an assured right to be paid before he parts with control of the goods that does not permit of any dispute with the buyer as to the performance of the contract of sale being used as a ground for non-payment or reduction or deferment of payment. To this general statement of principle as to the contractual obligations of the confirming bank to the seller, there is one established exception: that is, where the seller, for the purpose of drawing on the credit, fraudulently presents to the confirming bank documents that contain, expressly or by implication, material representations of fact that to his knowledge are untrue.”