Defaults to System Envioronment variable "SPOTIFY_CLIENT_ID"
client_secret
Defaults to System Envioronment variable "SPOTIFY_CLIENT_SECRET"
scope
Space delimited string of spotify scopes,
found here: https://developer.spotify.com/documentation/general/guides/scopes/.
All scopes are selected by default
Value
The Spotify Web API Token2.0 reference class object (see
httr::oauth2.0_token), or an error message.