英语翻译the issuing bank pay a certain amount to a third party a

英语翻译the issuing bank pay a certain amount to a third party against the surrender of stipulated documents made out in compliance with the terms and conditions of the credit purporting to cover the shipment of goods contracted for between the buyer and the seller.（翻译一下这句话,还有其中的purporting是什么词性,充当什么成分,