{"error":"Missing parameters. Use: ?s=song&a=artist, ?id=albumId, or ?url=appleMusicUrl","endpoints":{"search":"GET /?s=<track title>&a=<artist>&al=<album>&d=<duration in seconds>","albumId":"GET /?id=<numeric Apple Music album id>","albumUrl":"GET /?url=<music.apple.com album url>"},"params":{"s":"Track title as your source shows it.","a":"Artist name. The primary artist is enough.","al":"Album name exactly as your source shows it. Leave it out when you do not know it. Never send view counts, dates or other metadata here.","d":"Track duration in whole seconds. Used to pick the right version of a track."},"responses":{"429":"You are sending too many requests. Slow down and cache on your side.","200 with videoUrl":"Animated artwork found. Safe to cache.","200 with videoUrl null":"Album found without animated artwork. Safe to cache for a few days.","200 with error":"Definitive answer, e.g. no matching track or album not found. Safe to cache for a few days.","502 or 503":"Temporary failure. Retry later and do not cache."}}