curl --request GET \
  --url https://api.arcuserp.com/v1/entities/{entity_id}/reconciliation/ar-aging \
  --header 'Authorization: Bearer <token>'

{
  "object": "ar_aging",
  "as_of_date": "2023-12-25",
  "customers": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "current": 123,
      "days_1_30": 123,
      "days_31_60": 123,
      "days_61_90": 123,
      "days_over_90": 123,
      "total": 123
    }
  ],
  "totals": {}
}