curl -X DELETE "https://api.mycentralino.com/v1/calendar/blocks/15" \
  -H "X-API-KEY: sk_mycentralino_your_api_key"

<?php
$ch = curl_init('https://api.mycentralino.com/v1/calendar/blocks/15');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => 'DELETE',
    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.delete('https://api.mycentralino.com/v1/calendar/blocks/15', headers=headers)
print(response.json())