curl --request GET \
  --url https://api.pingproxies.com/1.0/public/user/proxy_user/retrieve/{proxy_user_id} \
  --header 'X-API-Private-Key: <api-key>' \
  --header 'X-API-Public-Key: <api-key>'

{
  "data": {
    "customer_id": 1955,
    "ip_address_authentications": [
      "17.172.224.47"
    ],
    "proxy_user_creation_datetime": "2023-09-28 12:34:56",
    "proxy_user_id": "stevejobs",
    "proxy_user_ip_address_authentication_limit": 3,
    "proxy_user_is_default": false,
    "proxy_user_is_deleted": false,
    "proxy_user_is_service_restricted": false,
    "proxy_user_is_strict_security": false,
    "proxy_user_last_update_datetime": "2023-09-28 12:34:56",
    "proxy_user_metadata": {
      "resell_order_id": "APPL-9876-5432"
    },
    "proxy_user_password": "apple1984",
    "proxy_user_residential_bytes_limit": 134142432,
    "proxy_user_residential_bytes_used": 31223,
    "restricted_service_ids": [
      "111-230-892"
    ]
  },
  "message": "Proxy User successfully retrieved."
}