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. How do you acknowledge a payment received. Cash acknowledgement form. I, a duly authorized representative of. Now that we have received your payment, we can (set out the next steps). Thanks for paying so promptly. This document is a receipt acknowledging payment received from an individual or entity. Explore the importance of acknowledgment letters in professional communication.