curl --request POST \
  --url https://api.highwayapi.ai/v3/async/veo-3.1-generate-firstlastframe \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "seed": 123,
  "image": "<string>",
  "prompt": "<string>",
  "last_image": "<string>",
  "resolution": "<string>",
  "aspect_ratio": "<string>",
  "sample_count": 123,
  "enhance_prompt": true,
  "generate_audio": true,
  "negative_prompt": "<string>",
  "duration_seconds": 123,
  "person_generation": "<string>"
}
'

{
  "task_id": "<string>"
}