I’m not a CoRE expert, but you found the right link. CoRE is a rule engine, so you can set up things like “if this light turns on, then do that action”. And one possibility for the action is to send a web request (under “Then” select “using Location” / “make a web request”). You may have to figure out how to send your query parameters, as they look non-standard to me. There’s a thread here where you can ask for help with CoRE.