The sample acknowledgement letters for receipt of payment provided below can be used as format templates for official and personal purposes. WITNESS my hand and official seal. Signature. (Seal).A notary public or other officer completing this certificate verifies only the identity of the individual. Tell the court that the other party received a summons or other legal papers in a civil case that were delivered to (served on) that party. "Explore our page to understand how to use a receipt for acknowledging payments legally in any transaction.