Every test that you create with Statuscake has a unique ID number, sometimes it can be useful to know the ID for a test when working with the API or alerts, tests are specified with the ID through the API, and the TestID also comes through with all the alerts.
In order to find the ID number for a test, simply go to the details page for that test and you will find what you are looking for in the address bar after the tid= field of the URL.
An example would be https://app.statuscake.com/xxxx.php?tid=133713, so in this case 133713 would be the TestID.