You can set-up low balance notifications here. Or click on the name of your Workspace in the top right corner and select 'Financial' from drop-down menu → ‘Preferences’ tab.
Under 'Balance Warning' select how you'll like be notified (via email, SMS or both) when your balance goes below a certain amount of your choice.
Set up your notifications preferences by writing down the email and mobile number where the balance warning should be sent to. The notifications can be sent to one or several people, just click on '+' if you wish another person also to receive them.