Get broadcast details

{
  "id": "cmp_abc123",
  "name": "Summer Sale",
  "status": "active",
  "paused": false,
  "disabled": false,
  "template": {
    "id": "wat_xyz789",
    "name": "summer_sale_v1",
    "status": "approved"
  },
  "reply_automation": {
    "id": "flow_aaa111",
    "name": "Sales Bot",
    "type": "ai_agent"
  },
  "launch": {
    "phone_number": "+14155552671",
    "delivery_mode": "bulk",
    "schedule_mode": "instant",
    "scheduled_launch_time": null,
    "scheduled_end_date": null,
    "launched_at": "2026-03-01T10:00:00Z",
    "audiences": [
      "VIP Customers"
    ]
  },
  "stats": {
    "total_recipients": 5000,
    "queued": 0,
    "sent": 4980,
    "delivered": 4800,
    "read": 3200,
    "clicked": 640,
    "replied": 120,
    "engaged": 760,
    "unsubscribed": 25,
    "failed": 20,
    "unknown": 0,
    "delivered_percentage": 96.4,
    "read_percentage": 66.7,
    "engaged_percentage": 15.8,
    "unsubscribed_percentage": 0.5,
    "click_per_unique_opens": 20.0
  },
  "created_at": "2026-03-01T09:00:00Z",
  "updated_at": "2026-03-01T10:05:00Z"
}