curl --request POST \
  --url https://demo.onlinebillingform.com/api/v1/vpn/servers/get \
  --header 'token: <api-key>'

{
  "success": true,
  "vpn_server": {
    "server_name": "UK2",
    "ip_address": "192.168.2.5",
    "ssh_port": 22,
    "ssh_username": "root",
    "max_connections": 0,
    "vpn_type": "openVPN",
    "flag_countries": "NL",
    "status_online": 0,
    "vpn_details": null
  }
}