curl -i 'https://vestibule.mx.com/users/{user_guid}/accounts/{account_guid}/account_numbers' \  -H 'Accept: application/vnd.mx.atrium.v1+json' \  -H 'MX-API-Key: {mx_api_key}' \  -H 'MX-Client-ID: {mx_client_id}'

{
  "account_numbers": [
    {
      "account_guid": "ACT-123",
      "account_number": "10001",
      "institution_number": null,
      "member_guid": "MBR-7c6f361b-e582-15b6-60c0-358f12466b4b",
      "routing_number": "68899990000000",
      "transit_number": null,
      "user_guid": "USR-fa7537f3-48aa-a683-a02a-b18940482f54"
    }
  ],
  "pagination": {
    "current_page": 1,
    "per_page": 25,
    "total_entries": 1,
    "total_pages": 1
  }
}