curl -X POST https://getrevox.com/api/call \
  -H "Authorization: Bearer sk_live_..." \
  -H "Content-Type: application/json" \
  -d '{
    "phone_number": "+3363456789",
    "assistant": {
      "prompt": "You are a virtual assistant calling candidates to inform them about a job opportunity.",
      "first_sentence": "Hi, this is Sarah from TechCorp. Do you have a moment?",
      "webhook_url": "https://your-app.com/webhooks/call-completed"
    },
    "call_retry_config": {
      "calling_window_start_time": "09:00",
      "calling_window_end_time": "18:00",
      "retry_delay_seconds": 7200,
      "max_retry_attempts": 3
    }
  }'