We regret we can't accept payment "cash against document".
We'll agree to change the terms of payment from L/C at sight to D/P at sight.
We accept D/P payment for future dealings.
We can do the business on 60 days D/P basis.
We agree to draw at 30 days D/P.
We'll draw D/P against your purchase.
As a special sign of encouragement, we'll consider accepting payment by D/P at this sales-purchasing stage.
We regret we can't accept "Cash against Documents" on arrival of goods at destination.
The buyer suggested D/A as the terms of payment, but the seller was unwilling to make any exception.
We can't agree to draw at 30 days D/A.
So it's better for us to adopt D/P or D/A.
I suppose D/P or D/A should be adopted as the mode of payment this time.
It would help us greatly if you would accept D/A or D/P.
Could you make an exception and accept D/A or D/P?