Paessler: Use StatusCake to Monitor Internal Devices with SMS Alert via PRTG

You may use the method below to monitor your internal devices with SMS alerts via PRTG. However, the alerts are the other way round:
StatusCake Alert Backup - PRTG / Internal Device Down
StatusCake Alert Down - PRTG / Internal Device Up

< StatusCake >
1. Add new test

2. Copy the URL

< PRTG >
1. Go to Setup > Account Settings > Notifications
2. Click on Add new notification and type in the necessary information as follows:
* Note: Change the URL of StatusCake from HTTPS to HTTP

3. Click on the respective sensor
4. Click on Notifications > Add State Trigger