We regret we can't accept payment "cash against document".

很抱歉，我们不能接受凭单付款办法。

Our payment term usually is to accept document against payment in 60 days, which we hope can satisfy you.

我方通常的支付条件是60天付款交单，希望这令你方满意。

All right. we accept your payment term of cash against document .

好吧，我们接受你方凭单据付现的方式。