curl --request GET \
  --url https://nudgen.net/api/v1/campaigns/{id}/stats \
  --header 'Authorization: Bearer <token>'

{
  "stats": {
    "totalSent": 123,
    "totalDelivered": 123,
    "totalOpens": 123,
    "totalClicks": 123,
    "ctr": 123,
    "totalFailed": 123,
    "totalSpamComplaints": 123,
    "totalHardBounces": 123,
    "totalSoftBounces": 123
  }
}