Invoker scans your application for any Notification class as well as all of your available "Notifiables" (for example User models). Just like mails, you can preview all built-in notification types such as Slack, Mail and Database. But even third-party notification channels can be previewed and sent using the Invoker UI.
Invoker scans the constructor parameters of the notifications and builds a user interface based on the scanned parameters.
If your notification accepts an Eloquent model as an input parameter, Invoker will automatically show you a dropdown field that allows you to search for the desired model.
Once you have all parameters in place, you can press the "Preview via xxx" button to retrieve an instant preview of the notification. To actually send out the notification, you can use the "Send" button.