Google tts ultimate node - questions, kinda

Sorry folks, but I just want to ask/check with people about this node.

When I'm logged into that machine and am looking.

~/.node-red/sonospollyttsstorage $ ls
hailingpermanentfiles  ttsfiles  ttspermanentfiles  ttsultimategooglecredentials

ttsfiles is/are the temporary files used/needed to get it to talk.
ttspermanentfiles...... I'm guessing are permanent files.

But how do I get to use them?

Do I need credentials?

Someone?