curl --request GET \
  --url https://your-instance.example.com/api/campaigns/analytics \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "totalCampaigns": 42,
    "scheduledCount": 5,
    "sentCount": 30,
    "failedCount": 1,
    "partialSuccessCount": 4,
    "cancelledCount": 2,
    "segmentedCount": 8,
    "segmentedPercentage": "19.05%",
    "totalMessages": 12450,
    "sentMessages": 12380,
    "scheduledMessages": 50,
    "failedMessages": 20,
    "overallSuccessRate": "99.4%"
  }
}