A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. How to fill out the Payoff Request Letter Templates?A 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish. Check out our car payment template selection for the very best in unique or custom, handmade pieces from our templates shops. A payoff letter is a document that provides detailed instructions on how to pay off a loan. How do I pay off my auto loan? Check out our car loan template selection for the very best in unique or custom, handmade pieces from our templates shops. An auto loan payoff letter is just a way to prove that you have paid in full for a car. Keep reading for a quick checklist of the last few remaining steps once you've made your final payment, or check out the video on completing your loan.