curl --request GET \
  --url https://demo.onlinebillingform.com/api/v2/vpn/servers/list \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://demo.onlinebillingform.com/api/v2/vpn/servers/list"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://demo.onlinebillingform.com/api/v2/vpn/servers/list', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://demo.onlinebillingform.com/api/v2/vpn/servers/list",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://demo.onlinebillingform.com/api/v2/vpn/servers/list"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://demo.onlinebillingform.com/api/v2/vpn/servers/list")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://demo.onlinebillingform.com/api/v2/vpn/servers/list")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body

{
  "success": true,
  "vpn_systems": {
    "data": [
      {
        "id": 30,
        "server_name": "Europe VPN 01",
        "ip_address": "10.0.0.30",
        "ssh_port": 22,
        "ssh_username": "root",
        "max_connections": null,
        "vpn_type": "openVPN",
        "flag_countries": "AD",
        "status_online": 1,
        "is_disabled": false,
        "connections_count": 1
      }
    ],
    "current_page": 1,
    "first_page_url": "https://demo.onlinebillingform.com/api/v2/vpn/servers/list?page=1",
    "from": 1,
    "last_page": 1,
    "last_page_url": "https://demo.onlinebillingform.com/api/v2/vpn/servers/list?page=1",
    "next_page_url": null,
    "path": "https://demo.onlinebillingform.com/api/v2/vpn/servers/list",
    "per_page": 15,
    "prev_page_url": null,
    "to": 1,
    "total": 1
  },
  "server_groups": [
    {
      "id": "c49f2148-adf3-469c-b1ca-5d68e28e7efb",
      "name": "Europe",
      "servers": []
    },
    {
      "id": "f584646b-7a83-42e8-b444-30f26b1d7696",
      "name": "USA",
      "servers": [
        {
          "id": 30,
          "server_name": "Europe VPN 01",
          "ip_address": "10.0.0.30",
          "vpn_type": "openVPN",
          "flag_countries": "AD",
          "status_online": true,
          "is_disabled": false,
          "connections_count": 1
        }
      ]
    }
  ]
}

{
  "success": false,
  "errors": {
    "per_page": [
      "The per page field must not be greater than 100."
    ]
  }
}

{
  "success": false,
  "errors": "Invalid API Key"
}

{
  "success": false,
  "errors": "Insufficient permissions for this endpoint."
}