View the list of Sample Business Letters Request for Clarification on Applying Payment Disclaimer: Be aware that some of these sample letters have legal, financial, or other implications. If you are not sure about the use of any letter, consult with an appropriate professional first. Request for Clarification on Applying Payment Dear In order to assist our accounts receivable department personnel, we request that you please include your statement stub with your payment and place a check mark next to those invoices you are including in your payment. This will enable proper crediting of your account. Thank you very much.