You can make KiSSFLOW send a webhook notification call to a remote system.
First open the workflow and find the point at which you want to send the data. Immediately after that task, click the plus button, then add the action called Send Data to a Webhook.
Add the URL where the webhook should send data. You can also add a conditional formula if you only want the update to happen under certain circumstances.
Click Done when finished and remember to publish the App.