Get Call Stats

curl --request GET \
  --url https://api.selcor.ai/v1/voice/calls/stats \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "since": "<string>",
    "total": 123,
    "avg_duration_seconds": 123,
    "by_status": {},
    "by_category": {},
    "by_sentiment": {}
  },
  "request_id": "<string>"
}