Yes, you can! In your account you can set up either a balance warning or an auto-order. If you set up the balance warning, you will be notified via email when your balance goes below a certain amount.
If you set up the auto-order, we will automatically create a new order for you for your desired amount when your balance goes below a certain amount. The receipt will be sent to your email with instructions to pay.
Please note this is not an auto-top up; you will still need to make a manual payment for your order.