A reference implementation of how to use the postMessage API to authorize Spotify Users from within an iframe
spotify-postmessage-implicit-grant by
api samples
audio-features
spotifyapi-workshop
spotify-artist-valence
spotify-authorization-code
spotify-search
spotify-client-credentials
spotify-audio-analysis
spotify-shared-top-artists
artist-explorer
spotify-track-self-similarity
spotify-web-playback-react
spotify-playlist-manager