An https address. The phone calls it when the button is tapped, and Notify servers are not involved, so a webhook on your own network works. It needs a button label too.
Shows values side by side like a small dashboard. One per line as Label: Value, up to six lines. For example CPU: 87% on one line and Memory: 62% on the next.
The Activity ID from the Start a live activity step, which looks like LA7K2P9Q. Leave it blank to change whichever tile this device is showing, which is what a one trigger, one action Applet needs.