@buckchucko said:
I got my API key but what version?
My Synology NAS support asks me......
"Ensure you are using a legacy API key (v3 auth) from TMDb, as Video Station does not support the v4 API key."
So is my API key this v3 auth version?

Yes. It is a string of 32 alphanumeric characters.
An example: 0123456789abcdef0123456789abcdef

There are not two types of API Key. Only one type.
I think that when they talk about API Key v4, they are referring to the API Read Access Token.
So the API Key that they accept is in your profile.
https://www.themoviedb.org/settings/api