There are no penalties or fees associated with paying off your loan early. You are only responsible for the amount of interest accrued until the date of payoff.
If your account has recurring payments on, any payoff amount on or after that date assumes the recurring payment scheduled will be successful. For example, if you would like to pay off your loan on the 15th, and your account has recurring payments scheduled for the 14th, the payoff amount assumes the payment for the 14th is successful. If the recurring payment is canceled or is unsuccessful, the payoff amount is no longer valid and would need to be recalculated.