curl --request POST \
  --url https://api.kie.ai/api/v1/mj/generateVary \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "taskId": "96a5****67tr",
  "imageIndex": 1,
  "waterMark": "my_watermark",
  "callBackUrl": "https://example.com/callback"
}'

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "2182668588ae82da0bc553c07c48ca38"
  }
}