curl --request POST \
  --url https://api.highwayapi.ai/v3/gemini-3.1-flash-image-edit \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "size": "<string>",
  "google": {
    "web_search": true,
    "image_search": true
  },
  "prompt": "<string>",
  "image_urls": [
    {}
  ],
  "aspect_ratio": "<string>",
  "image_base64s": [
    {}
  ],
  "output_format": "<string>"
}
'

{
  "image_urls": [
    {}
  ],
  "grounding_metadata": {}
}