Calling a plugin in HS3 script

In HS2, I could call pushp to send a message within a script using this example:
hs.plugin("Pushover (3P)").PushMessage("some message text")

In HS3 I believe hs.plugin has been replaced by hs.pluginFunction. But based on the documentation, I tried with this example but it fails:

hs.PluginFunction("Pushover (3P)").PushMessage("some message text",nothing)

How is this called in HS3?

Robert