Nium provides many types of notifications that allow you to anticipate and manage
various situations, such as a low card balance or a purchase made.
You will be provided with the list of IPs from where notifications are issued, together with
a notification key so that you can validate that the notifications you receive are
genuine.
The documentation for supported notifications can be found in the Notifications API Reference
Notification endpoint
This API endpoint "handleNotification" described in the Notifications API reference must be installed on your server, so that you can receive notifications.