fileload curl upload - complete

<?php
/**
 * First: Login and prepare upload
 */
$login = array(
    // Mandatory
    'email' => '[email protected]',
    'password' => md5('secretpasswort'),

    // Optional parameters:
    'presentation'  => '', // "1 = ONLY ZIP Download | 2 standard downloadside | 3 Image slider"
    'receiver'      => '', // "[email protected], [email protected]..."
    'message'       => '', // "Here your files."
    'zip_code'      => '', // "0000, 1111"
    'sms_number'    => '', // "+97100000, +97111111"
    'file_password' => '', // "secret password"
    'password_hint' => '', // "password notice / tip"
    'email_alias'   => '' // "[email protected]"
);


// Do Curl Request
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.fileload.io/startupload');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $login);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$query = curl_exec($ch);
if (curl_errno($ch)) { die('Error: ' . curl_error($ch)); }
curl_close($ch);
$response = json_decode($query)[0];

if (isset($response->error) AND $response->error == 'unknown_user') {
    echo 'Error while login. Email or password wrong!';
}

echo '<pre>';
print_r($response);
echo '</pre>';


/**
 * Second: Begin upload...
 */
// Do Curl Upload
$ch = curl_init($response->server);

// Create a CURLFile object; Syntax: public CURLFile::__construct ( string $filename [, string $mimetype [, string $postname ]] )
$cfile = new CURLFile('50M.zip','application/zip','50M.zip');

// Assign POST data
$prepare_transfer = array(
    'server'      => $response->server,
    'email'       => $response->email,
    'password'    => $response->password,
    'transfer_id' => $response->transfer_id, // OR FIX to upload into same folder ''
    'file'        => $cfile,
    'chunk'       => 0, // Current chunk
    'chunks'      => 0 // Total number of chunks
);

// Request a HTTP POST
curl_setopt($ch, CURLOPT_POST, true);

// Specify data to POST to server
curl_setopt($ch, CURLOPT_POSTFIELDS, $prepare_transfer);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// Execute the handle
$upload = curl_exec($ch);

if (curl_errno($ch)) { die('Error: ' . curl_error($ch)); }
curl_close($ch);

$file = json_decode($upload)[0];
#echo $file->url;

echo '<pre>';
print_r($file);
echo '</pre>';