curl --request GET \
  --url https://api.embedreach.com/api/segments/user/{externalId}

{
  "success": true,
  "message": "<string>",
  "data": {
    "segments": [
      {
        "id": "<string>",
        "name": "<string>",
        "description": "<string>",
        "conditions": [
          {
            "field": "userId",
            "value": [
              "<string>"
            ],
            "operator": "equals"
          }
        ],
        "type": "all_users",
        "createdAt": "<string>",
        "updatedAt": "<string>"
      }
    ]
  }
}