curl --request POST \
  --url https://api.kie.ai/api/v1/generate/add-vocals \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "A calm and relaxing piano track.",
  "tags": "partylied, Mallorca Hit, schlager, melodie, Mann und Frau Singen abwechselnd, gute Laune, fröhlich, Disko Fox, Beliebt",
  "title": "Relaxing Piano",
  "negativeTags": "重金属, 强节奏鼓点",
  "style": "Jazz",
  "vocalGender": "m",
  "styleWeight": 0.61,
  "weirdnessConstraint": 0.72,
  "audioWeight": 0.65,
  "uploadUrl": "https://example.com/music.mp3",
  "callBackUrl": "https://example.com/callback"
}'

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "5c79****be8e"
  }
}