If you prefer to manually add credits to your account OR have some monitoring in place to know when your Auto Recharge method fails, you can use Low Balance Alerts.
Navigate in the left pane to Billing > Payments, then click on the button Low Balance Alerts.
In this view, you will see the following options
You can select the level at which you'll get a notification regarding the low balance and an email address that the notification will be sent to. Only a single email address is accepted -- however, it can be an alias such as [email protected] to get forwarded to multiple people.