If you currently have a loan with Lightstream paying online is easy. Simply go to https://www.lightstream.com/customer-sign-in and sign in in the middle at Customer Sign In. You can choose between:Making a one time payment. Enrolling in Autopay from your checking account. Please note that many banks and financial institutions offer a rate discount for enrolling in autopay (to reduce your interest expense and lower your monthly payment). Lightstream would have highlighted this option to you to get you into a lower interest rate when you got pre-qualified during your application process for your auto financing.If you can’t pay online, you’ve also got the option to:Pay your bill over the phone: Call 1-800-447-8994Pay your bill through the mail: Send a check to LightstreamLightstreamPO Box 117320Atlanta, GA 30368-7320