Apple Music metadata block How to request and read the Apple Music metadata block on an AudD match: the track URL, AAC preview, artwork template, catalog ID, and ISRC. → Deezer metadata block How to request and read the Deezer metadata block on an AudD match: the Deezer track link, MP3 preview, album cover art, and numeric IDs. → Enterprise response and match fields The chunked response shape of the AudD enterprise endpoint (enterprise.audd.io): per-chunk offset, per-song score, ISRC/UPC, accurate offsets, and the request parameters that control chunking. → Error codes reference Every AudD API error code, grouped by category, with the typed SDK exception family each maps to and whether it is safe to retry. → Glossary Concise definitions of AudD-specific terms an integrator or agent will encounter: endpoints, result fields, identifiers, streams, and request parameters. → MusicBrainz metadata block How to request and read the MusicBrainz metadata block on an AudD match: an array of recordings with MBIDs, ISRCs, match scores, and expanded releases. → Napster metadata block (no longer available) Napster metadata is no longer available from the AudD API: the platform ceased operations. What happens if you still request it, and what to use instead. → Provider metadata blocks (Apple Music, Spotify, Deezer, MusicBrainz) How to request Apple Music, Spotify, Deezer, and MusicBrainz metadata on an AudD match, where each block's fields are documented, and when song_link is enough instead. → Recognition result fields The fields of the result object returned by the standard AudD recognition endpoint (api.audd.io), including timecode, song_link, audio_id, and provider metadata blocks. → Spotify metadata block How to request and read the Spotify metadata block on an AudD match: the track URI and open.spotify.com URL, preview, album artwork, and IDs. → Stream callback and longpoll payload reference The exact JSON your callback receiver and longpoll consumer get from AudD streams: result bodies, notification bodies, the getStreams list, and the longpoll keepalive. →