مشکل درگاه درپاخت زرین پال

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Zarinpal {

private $merchant_id;
private $authority;
private $error;
private $ref_id;
private $url;

private $wsdl_url = 'https://www.zarinpal.com/pg/services/WebGate/wsdl';
private $pay_url = 'https://www.zarinpal.com/pg/StartPay/';

public function __construct($params)
{
$this->merchant_id = $params['merchant_id'];
}

public function request($amount, $desc, $callback, $email = '', $mobile = '')
{
$params = [
'MerchantID' => $this->merchant_id,
'Amount' => $amount,
'Description' => $desc,
'CallbackURL' => $callback
];

if ($email)
$params['Email'] = $email;

if ($mobile)
$params['Mobile'] = $mobile;

$client = new SoapClient($this->wsdl_url, [
'encoding' => 'UTF-8'
]);

$result = $client->PaymentRequest($params);

if ($result->Status !== 100)
{
$this->error = $result->Status;
return FALSE;
}

$this->authority = $result->Authority;
$this->url = $this->pay_url.$this->authority;
return TRUE;
}

public function redirect()
{
if ( ! function_exists('redirect'))
{
$CI =& get_instance();
$CI->load->helper('url');
}

redirect($this->url);
}

public function verify($amount, $authority)
{
$params = [
'MerchantID' => $this->merchant_id,
'Amount' => $amount,
'Authority' => $authority
];

$client = new SoapClient($this->wsdl_url, [
'encoding' => 'UTF-8'
]);

$result = $client->PaymentVerification($params);

if ($result->Status !== 100)
{
$this->error = $result->Status;
return FALSE;
}

$this->ref_id = $result->RefID;
return TRUE;
}

public function sandbox()
{
$this->wsdl_url = 'https://sandbox.zarinpal.com/pg/services/WebGate/wsdl';
$this->pay_url = 'https://sandbox.zarinpal.com/pg/StartPay/';
}

public function get_authority()
{
return $this->authority;
}

public function get_error()
{
return $this->error;
}

public function get_ref_id()
{
return $this->ref_id;
}
}