Create Plesk Scheduling Task:

Select a Subscription, navigate Websites & Domains > Scheduled Tasks (on right menu) > Add Task

Enter Scheduled task name, choose notification type.

Path to an executable file: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

Arguments: -c "(new-object system.net.webclient).downloadstring('http://yourdomain.test/script.aspx')"

Replace link http://yourdomain.test/script.aspx with link to script on your website.

Select frequency. Do not set Every minute as it can cause server resource overuse and subscription suspended.