A string that uniquely identifies a piece of content.
A ContentID references content by a Fountain id, a podcast GUID, or an external platform id. Most endpoints accept any of these interchangeably.
Fountain id
{type}:id:{id}
e.g. episode:id:abc123
Podcast GUID
{type}:guid:{guid}
e.g. show:guid:9b...e1
Podcast Index feed
podcastindex:feed:{id}
e.g. podcastindex:feed:920666
episode:id:abc123