curl --request POST \
  --url https://vip.xmsmartlink.com/v1beta/models/gemini-3-pro-image-preview:generateContent \
  --header 'Content-Type: application/json' \
  --header 'x-goog-api-key: <api-key>' \
  --data '
{
  "contents": [
    {
      "role": "user",
      "parts": [
        {
          "text": "Draw a cute cat"
        }
      ]
    }
  ],
  "generationConfig": {
    "responseModalities": [
      "IMAGE"
    ],
    "imageConfig": {
      "aspectRatio": "1:1",
      "imageSize": "2K"
    }
  }
}
'

{
  "candidates": [
    {
      "content": {
        "role": "model",
        "parts": [
          {
            "inline_data": {
              "mime_type": "image/png",
              "data": "<BASE64_IMAGE_DATA>"
            }
          }
        ]
      },
      "finishReason": "STOP"
    }
  ]
}