curl --request GET \
  --url https://api-{region}-{cluster}.benchmarkemail.com/api/reports/email/{id}/engagement \
  --header 'X-API-Key: <api-key>'

{
  "end": "2024-09-24T17:00:00.000Z",
  "histogram": [
    {
      "date": "2024-09-23T17:00:00.000Z",
      "detail": {
        "uniqueClicks": 1,
        "uniqueOpens": 3
      },
      "total": 4
    }
  ],
  "peak": {
    "endDate": "2024-09-23T17:00:00.000Z",
    "startDate": "2024-09-23T17:00:00.000Z",
    "total": 4
  },
  "start": "2024-09-23T17:00:00.000Z"
}