curl --request POST \
  --url https://api.sinancode.com/v1/generate/k/imagen4-fast \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "prompt": "a serene mountain landscape",
  "aspect_ratio": "16:9",
  "negative_prompt": "blurry, low quality",
  "num_images": 1,
  "seed": 0
}
'

{
  "task_id": "01234567-89ab-cdef-0123-456789abcdef"
}