This letter acknowledges the receipt of your payment for the products supplied. Learn what an acknowledgement receipt is and how to create one for your business (with a template and two examples).How to write an Acknowledgement Receipt Letter? An easy way to start is to download this Sample Payment Receipt Acknowledgement Letter template now! Instructions to send a certified letter, return receipt requested. We will inform you as soon as possible if any items you have ordered are not available. Acknowledgement and acceptance of your order. How to write an Acknowledgement Receipt Letter? Requests are processed in the order they are received. Please fill out this form completely in ink.