Thank the customer for choosing to do business with you, and regretfully refuse the request. Explain why the application was denied and leave the door open to try again at a later time.
1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
Thank you for taking the time to apply for credit with Abc Company. We welcome your business but unfortunately we are unable to extend credit to you at this time. Your credit application was denied because <reason for denial>.
When your situation changes, we would be happy to reconsider your application. In the meantime, we welcome the opportunity to do business with you on a cash basis.
encl: <List of enclosed items goes here>