帮忙翻译一下——"我们要求用保税的、不可撤销的、见证即付的信用证付款。"

We demand pay by boned,irrepealable and payment immediate credit card

irrevocable, confirmed L/C payable by draft at sight is required.

银行开不出来这种条件的信用证

What we demand is a bonded，irrevocable, confirmed L/C payment.
看语气在这种场景下还是用what 句式比较妥当

Bonded,irrevocable L/C payable at sight is required.
如果是保兑就把Bonded改为Confirmed

A bonded，irrevocable, confirmed L/C payable by draft at sight is required.