Ensure that employees sign acknowledgment quickly upon receipt. A sample acknowledgement letter helps acknowledge payments received from clients as advance payments, membership, loans, or school fees.The document is a letter acknowledging receipt of a verbal complaint. RECEIPT OF APPEAL ACKNOWLEDGEMENT LETTER. Date. This can include items such as resumes, payment documents, insurance information, or memos like resignation letters and outofoffice messages . This document is a receipt acknowledging payment received from an individual or entity. Thank you for the opportunity to serve alongside each of you. CalWORKs are not eligible to incentive payments. Turn in all receipts, invoices, and relevant paperwork in a timely manner. (see sample letter, page 15).