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There's good news and bad news here. The bad news is, there's really nothing you can do to change a late payment, once it's been reported to a credit bureau as negative information. You just have to wait it out, and it will come off your credit report within a few years. But the good news is, it's actually unlikely that your missed payment has been reported to the credit bureaus. Of course, I'm assuming that when you say, "missed payment" you actually mean "late payment," and you've now brought your account into good standing. If this is the case, and if the payment was not more than 30 days late, there's very little chance it will bring your credit score down. If you're worried, go ahead and pull a copy of your credit report to check whether the late payment was recorded. Chances are, you're fine – and next time, you'll remember that due date.