The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.The certificate of acknowledgment (PDF) must be in the form set forth in California Civil Code section 1189. 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. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. Thank you so much for employing your philanthropy to help bring this message to Cal Performances so that it can be shared with Northern California audiences. Acknowledgement of Receipt Letters are important in some ways. The next step is to write the acknowledgment statement, where you include the name of the item or document the recipient is accepting.