A payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work.Discover more about per diem interest—the daily interest on a loan that occurs outside of the standard repayment period. By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. The first step is to get in touch with your lender or loan servicer. You can find their contact information on your monthly statements. Please contact Customer Support at 877-672-2265 to request the payoff amount for a Mortgage and Home Equity Line of Credit (HELOC). Personal and Auto Loans It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. Call our 24-hour automated service dedicated to payoff quotes at 1-877-505-2894.