No, don't mail payments to the service centers. There is a section of your bill with an address you can mail your payment to, or you can call in and ask for the address. This is an old question but I wanted to make sure anyone else with the same question had the correct answer.
4423 n division st. Spokane WA 99207. It's easier to pay them online!
4423 N Division St, Spokane, WA 99207
4423 N. Division st. 99207
Thanks! Your answer is awaiting moderation.