URL question

[marshallarts]

First time here...

I have purchased a couple of Buttons, which will arrive in the next few days.  One thing is not entirely clear to me:  can the URL I assign to the button actions contain a port number, like this:

192.168.1.123:nnnn/p1/p2

I want to use these buttons to fire events in a separate home automation system I use that is not part of the Shelly ecosystem.  Its server runs on an Android tablet, and triggering events via its REST API requires sending an HTTP call to a port number other than 80.  I do not see a parameter in the Button settings for a port number, so I am hoping it can be incorporated into the URL as shown.  I also do not see any way to specify what type of HTTP request the button sends, and the documentation does not indicate - is it always a PUT, a POST, what?

I know I will find out soon enough when I have the buttons, but it would be nice to have it confirmed.