Paying off your credit card on time each month is critical for maintaining a solid credit score and preventing late fees from piling up. For Discover card users, the simplest way to make a payment is to create a user account on the Discover website. If you prefer not to put your financial information online, you can also submit a payment through the mail in the form of a check or money order. To make a Discover card payment online, first visit discovercard. To learn how to make a Discover card payment by mail, read on! This article was co-authored by Michael R. Michael R. Lewis is a retired corporate executive, entrepreneur, and investment advisor in Texas. Categories: Credit Cards.