You can update your payment information via the link below:
Sign In
This will be the same as your SmartAC.com app login
To Change Payment Method
If your previous payment method has failed you can select “Billing” and tap "Fix problem" to add a new payment method.
If you're just updating and your payment has not failed select “Billing” and “+ Add Payment Method” to add a new credit card. If the renewal date has expired you will need to add the card again with an updated renewal date.
If you want to delete the previous credit card on the account click on the Delete to the right of the card details you need to remove once the new card is added.