Your proposal is acceptible. I will have the shipment waiting a week after next. I shall expect payment by the end of the month.
Your last payment was 10% short. I've allowed your debts to accumulate to long. Pay the full debt by next Friday, or I'll be forced to sell my wares elsewhere.
I need 15 gross of your finest goods. I'll be by some time on Wednesday to pay for them. Our agreement was half now, half in 30 days.
Your offer was ludicrous. My merchandise is worth twice that at least. Because we have done business before, and because you are known to be trustworthy, I am willing to give you a 15% discount, but no more.