Serve the avatar of a person the page of the share link shows, as the author of a comment it lists or of a reply to one.
GET
/shared/playlists/{token}/pictures/thumbnails/persons/{person_id}.png
curl \
--request GET 'http://api.example.com/shared/playlists/{token}/pictures/thumbnails/persons/{person_id}.png' \
--header "Authorization: $API_KEY"