Dear
This letter will serve to confirm our agreement regarding your purchase of, and payment for, certain merchandise from our corporation. We have agreed to ship the below mentioned merchandise to you:
You agree to abide by our printed terms and conditions, and you additionally agree to pay for the merchandise in three equal payments. The first payment shall be sent so as to be received by my office not later than (date). The second payment shall be received not later than thirty days later, and the third payment shall be received not later than thirty days after the second payment. In no event shall payment be received later than (date) Please sign a copy of this letter and return it to us. Upon receipt of your confirmation of our agreement, I shall release shipment of the aforementioned merchandise