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What identifiers does the Apple Music album route accept?
Pass either an Apple Music album id (albumId, for example 1468058165) or a public https://music.apple.com/{cc}/album/…/{id} URL. One of albumId or url is required. A song URL (?i= on an album path) is not an album lookup.
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This answer comes from Apple Music data API, which covers the full detail, endpoints and pricing in credits.