}
if (isset($_POST["endUserId"])) {
    $endUserId = $_POST["endUserId"];
}
if (isset($_POST["referenceCode"])) {
    $referenceCode = $_POST["referenceCode"];
}
if (isset($_POST["referenceSequence"])) {
    $referenceSequence = $_POST["referenceSequence"];
}
$endpoints = new ServiceEndpoints();
$paymentResponse = null;
if (!isset($submit)) {
    $username = "******";
    $password = "******";
    $endpoint = $endpoints->getAmountReservationReleaseEndpoint();
    $endUserId = "tel:+123456789";
    $referenceCode = "REF-12345";
    $referenceSequence = 4;
} else {
    $endpoints->setAmountReservationReleaseEndpoint($endpoint);
    $reservation = new Reservation($endpoints, $username, $password);
    $paymentResponse = $reservation->releaseReservation($endUserId, $referenceCode, $referenceSequence);
}
?>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
  <head>    
    <title>
      GSM World | OneAPI Toolkit
    </title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />