curl -X POST https://api.example.com/hailuo/video \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"prompt": "A serene lake at sunset with mountains in the background",
"model": "hailuo-video-01",
"duration": 5,
"aspect_ratio": "16:9"
}'