Kling 4.0 Flash API

{
  "additionalProperties": false,
  "properties": {
    "aspect_ratio": {
      "default": "auto",
      "description": "Output aspect ratio; auto follows the reference images or video.",
      "enum": [
        "auto",
        "16:9",
        "9:16",
        "1:1",
        "21:9"
      ],
      "type": "string",
      "x-ui": {
        "order": 80,
        "widget": "select"
      }
    },
    "duration_seconds": {
      "default": 5,
      "description": "Output length in whole seconds, from 3 to 20. Billed per second.",
      "maximum": 20,
      "minimum": 3,
      "type": "integer",
      "x-ui": {
        "affects_price": true,
        "order": 60,
        "step": 1,
        "unit": "s",
        "widget": "slider"
      }
    },
    "keep_original_audio": {
      "default": false,
      "description": "Keep the reference video's own sound instead of generating new audio. Only used with a reference video.",
      "type": "boolean",
      "x-ui": {
        "order": 63,
        "widget": "switch"
      }
    },
    "prompt": {
      "description": "Say what each reference is and what the shot should do with it. Refer to images as @Image1, @Image2 and to videos as @Video1, @Video2, numbered in upload order.",
      "minLength": 1,
      "type": "string",
      "x-ui": {
        "order": 100,
        "primary": true,
        "reference_tokens": {
          "reference_image_urls": "@Image{index}",
          "reference_video_urls": "@Video{index}"
        },
        "widget": "textarea"
      }
    },
    "reference_image_urls": {
      "description": "Reference images for characters, objects, outfits or places, up to 10. Refer to them as @Image1, @Image2 and so on.",
      "items": {
        "contentMediaType": [
          "image/jpeg",
          "image/png",
          "image/webp",
          "image/gif"
        ],
        "format": "uri",
        "type": "string"
      },
      "maxItems": 10,
      "minItems": 1,
      "type": "array",
      "x-ui": {
        "max_size_mb": 10,
        "order": 90,
        "widget": "multi-upload"
      }
    },
    "reference_video_urls": {
      "description": "Optional reference videos for motion, camera and pacing, up to 5 and 20 seconds in total. Refer to them as @Video1, @Video2. With a reference video every output second is billed at a higher per-second rate.",
      "items": {
        "contentMediaType": [
          "video/mp4",
          "video/webm",
          "video/quicktime"
        ],
        "format": "uri",
        "type": "string"
      },
      "maxItems": 5,
      "minItems": 1,
      "type": "array",
      "x-ui": {
        "accept": [
          "video/mp4",
          "video/webm"
        ],
        "affects_price": true,
        "max_total_duration_seconds": 20,
        "order": 88,
        "widget": "multi-upload"
      }
    }
  },
  "required": [
    "prompt"
  ],
  "type": "object",
  "x-pricing": {
    "billingMode": "formula",
    "presenceFields": {
      "with_video": "reference_video_urls"
    },
    "variantFields": [
      "with_video"
    ],
    "variantKeyOmitDefaults": [
      "with_video"
    ]
  }
}