curl -X GET "https://api.mycentralino.com/v1/calendar/calendars" \
  -H "X-API-KEY: sk_mycentralino_your_api_key"

<?php
$ch = curl_init('https://api.mycentralino.com/v1/calendar/calendars');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => ['X-API-KEY: sk_mycentralino_your_api_key']
]);
$response = curl_exec($ch);
curl_close($ch);
print_r(json_decode($response, true));

import requests

headers = {'X-API-KEY': 'sk_mycentralino_your_api_key'}
response = requests.get('https://api.mycentralino.com/v1/calendar/calendars', headers=headers)
print(response.json())