How should a host be notified about parameter list changes from a plugin (eg parameters deleted, added or reordered)

Thank you for your response! So I am right that kParamTitlesChanged means the count and order of parameters changed but just the names of the parameters changed right?

I’m actually asking as a host developer (Bitwig Studio) not a plugin developer. We now also take care of parameter deletions that could even be automated.

Nick