curl --request POST \
  --url https://www.anyfast.ai/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "flux-1-kontext-pro",
  "prompt": "把背景换成日落沙滩",
  "input_image": "<string>",
  "n": 1,
  "size": "1024x1024",
  "output_format": "jpeg",
  "seed": 123
}
'

{
  "created": 123,
  "data": [
    {
      "b64_json": "<string>"
    }
  ]
}