veo3-fast (image to video)

curl --location 'https://gptproto.com/api/v3/google/veo3-fast/image-to-video' \
--header 'Authorization: Bearer sk-xxxxxx' \
--header 'Content-Type: application/json' \
--data '{
  "prompt": "A young woman walks alone under a transparent umbrella in a quiet alley during light rain, soft city lights reflecting on the wet pavement. Her pace is calm and thoughtful. The camera follows slowly behind her, occasional droplets hitting the lens. Subtle piano music plays, evoking a melancholic but peaceful mood. Dreamy, cinematic, slightly slow motion.",
  "aspect_ratio": "16:9",
  "image": "https://oss.heyoos.com/2025/11/12/d5c2f08479b9452aacbcf9963631ce21.jpeg",
  "enhance_prompt": true
}'

{
  "error": {
    "message": "Invalid signature",
    "type": "401"
  }
}