Login the Domain Manager and go to Finance > Watermarks
Watermarks are threshold indicators to keep track of the development of your account's balance. You'll find the overview under Finance > Watermarks when logged in to the Domain Manager.
By default, a number of levels are set. Each currency in your account has its own set of watermarks.
You can set the number of levels and their heights to your own preferences. Click on the Update button to change the values.
In order to make sure you actually receive the watermark notifications on the desired contact, it's necessary to create a WaterMarkReached-event in the notification rules page.
Next, you should double check if the notification rule is set properly.
If not set properly, set a WatermarkReachedEvent in the notification rules using the guide accessible through the button below. Also, a detailed description on how to set up notification rules is given there.