const response = await fetch('https://cockpit.voxbi.com/api/v1/{pbx_id}/user/calendar', {
  method: 'GET',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': `Bearer ${YOUR_TOKEN}`,
  },
});

const data = await response.json();
console.log(data);

import requests

response = requests.get('https://cockpit.voxbi.com/api/v1/{pbx_id}/user/calendar',
    headers={'Authorization': f'Bearer {YOUR_TOKEN}'}
)
response.raise_for_status()
data = response.json()
print(data)

<?php
$context = stream_context_create([
    'http' => [
        'method'  => 'GET',
        'header'  => "Content-Type: application/json\r\nAuthorization: Bearer YOUR_TOKEN",
    ],
]);

$response = file_get_contents('https://cockpit.voxbi.com/api/v1/{pbx_id}/user/calendar', false, $context);
$data = json_decode($response, true);
print_r($data);