Error: Payfort Apple Pay service response error Failed to execute service?

Question

I integrated Apple Pay service of Payfort using PHP but got error in response.

Failed to execute service

have applied all possible solutions including regenerating all the apple certificates. I have attached the code which i have used to send request to payfort. have encodes some apple payment token parameters to base64 because directly I'm getting invalid parameter errors .

<?php 
 
   $apple_data = base64_encode($_GET['apple_data']);
   $apple_signature = base64_encode($_GET['apple_signature']);
   $apple_transactionId = $_GET['apple_transactionId'];
   $apple_ephemeralPublicKey = base64_encode($_GET['apple_ephemeralPublicKey']);
   $apple_publicKeyHash = $_GET['apple_publicKeyHash'];
   $apple_displayName = $_GET['apple_displayName'];
   $apple_network = $_GET['apple_network'];
   $apple_type = $_GET['apple_type'];

   $merchant_reference=rand(0, getrandmax());
   $SHA_Request_Phrase='***********';

   $arrData = array(
     'access_code' => '*******',
     'amount' => 100,
     'apple_data'            => $apple_data,
     'apple_signature'       => $apple_signature,
     'apple_header'          => [
        'apple_transactionId'=> $apple_transactionId,
        'apple_ephemeralPublicKey'=> $apple_ephemeralPublicKey,
        'apple_publicKeyHash'=> $apple_publicKeyHash,
     ],

     'apple_paymentMethod'   => [
        'apple_displayName'=> $apple_displayName,
        'apple_network'=> $apple_network,
        'apple_type'=> $apple_type,
     ],
     'command' => 'PURCHASE',
     'currency' => 'SAR',
     'customer_email' =>"[email protected]",
     'customer_name' =>"test",
     'digital_wallet'=>'APPLE_PAY',
     'language' => 'en',
     'merchant_identifier' => '****',
     'merchant_reference' =>$merchant_reference,
     'order_description' => 'Package payment',
     'phone_number' =>'23232322',
     'return_url' => 'https://applepay.epcreport.net',
  );
  $shaString = '';
  ksort($arrData);

  foreach ($arrData as $key => $value) {
    if(is_array($value)){
        $shaSubString = '{';
        foreach ($value as $k => $v) {
            $shaSubString .= "$k=$v, ";
        }
        $shaSubString = substr($shaSubString, 0, -2).'}';
        $shaString .= "$key=$shaSubString";
    }else{
        $shaString .= "$key=$value";
    }
 }

 $shaString = $SHA_Request_Phrase . $shaString . $SHA_Request_Phrase;
 $signature = hash('sha256', $shaString);
 $arrData['signature'] = $signature;
 $arrData=json_encode($arrData);

 $url="https://sbpaymentservices.payfort.com/FortAPI/paymentApi";

// create a new cURL resource
 $ch = curl_init();

 $headers = array("Content-Type: application/json");
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_HEADER, 1);
 curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 curl_setopt( $ch, CURLOPT_RETURNTRANSFER, false );
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $arrData);

 if(curl_exec($ch) === false)
 {
    echo '{"curlError":"' . curl_error($ch) . '"}';
 }

 // close cURL resource, and free up system resources
  curl_close($ch);  
 ?>