Revocable unconfirmed banker's credit The Irrevocable Letter of Guarantee Issued by the Seller's Bank 可撤销的银行未保兑信用证买方开立的不可撤销的保证函
A letter of credit is a banker's guarantee that payment will be made on presentation of all the required shipping documents. 信用证是银行有条件的付款承诺:即需在提交要求的船运单据后才会付款。