the amount of each draft must be endorsed on the reverse side of this credit by the negotiation bank这句话应该怎么理解呢,请达人相告,谢谢
还有一句，也不是很理解：
AN EXTRA PHOTOCOPY OF INVIECE AND TRANSPORT DOCUMENTS ARE REQUIRED FOR ISSUING BANK'S FILE, USD10.00 OR ITS EQUIVALENT WILL BE DEDUCTED UPON PAYMENT IF SUCH COPIES NOT PRESENTED.