<?php
$ch = curl_init('https://rediafile.com/cloud/api/v2/authorize');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
'username' => 'your_username',
'password' => 'your_password',
]));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$resp = curl_exec($ch);
curl_close($ch);
echo $resp;