The dealer must, within 7 days, notify the lien holder in writing that the vehicle has been traded in. Loan application information.Start your application online. A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. OneMain loan specialists in the S Redwood Rd branch in Salt Lake City, UT are here to help with personal loan needs. Salt Lake City, UT 84165-0250. The process should take a minimum of 30 days to complete. How do I fill this out? Whether you are a dealer or a loan customer, Westlake has the resources to help you. Contact Westlake Financial today.