As you might know, you're able to SMS your candidates. To make sending SMS easier, you can auto-renew the credits used when texting. This means that when your credits are running low, they will automatically be refilled. Don't let credits come in the way of your next great hire!
To set this up, go to Settings→SMS. Here you'll find the option to toggle Auto renew credits on.
Set the lowest amount the credits are allowed to drop to, and then how many new credits you'd like to add in the renewal. When the credits get auto-renewed, an automatic purchase is done