A mortgage payoff letter can come in two forms. One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan.We will provide a payoff statement and accept payment on the account. Complete our Mortgage service or holder of the lien on a property form to receive a copy. To initiate this process, kindly have the authorized borrower complete and submit a payoff authorization form to our loan servicing department. San Antonio, TX 78269-2408. Or Fax to (866) 493-1441. Have a Question about an Existing Loan? Need to make a payment, request a payoff amount, etc? Payoff Request Form.