An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries. Here are 5 steps to performing an acknowledgment.The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. A good donor acknowledgment letter is both a transaction record and a donor engagement opportunity. Here's how to write one. Check out our letter of acknowledgement template selection for the very best in unique or custom, handmade pieces from our templates shops.