付款担保 meaning in Chinese

payment bond
security of payment

Type of bank instrument as payment guarantee : unconditional , irrevocable , transferable , revolving , confirmed , documentary letter of credit shall be issued by the buyer ' s bank , defined as a top 25 bank , directly to the sellers bank shown in appendix 6
作为付款担保的银行文件：无条件的，不可撤销的，可转让的循环保兑跟单信用证由排行前25家的卖方银行根据附录6的条款直接发到卖方银行。