Acknowledgement Sample Forms: I. Form for Ordinary Certificate of Acknowledgment. Thank you for your contribution of __________________.The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. 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. 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. Check out our cash acknowledgement template selection for the very best in unique or custom, handmade pieces from our templates shops.