MolPay Recurring Test

$params = array(
                            'RecordType' => 'T',
                            'MerchantID' => 'SB_islamicrelief',
                            'SubMerchant' => 'ISLAMICRELIEF',
                            'Token' => '4012888888881881',
                            'OrderID' => '101',
                            'Currency' => 'MYR',
                            'Amount' => '100.00',
                            'BillingName' => 'Ahmad Fazli Ismail',
                            'BillingEmail' => 'fazli@cloud.org.my',
                            'BillingMobile' => '0139060506',
                            'BillingDescription' => 'Address Test',
                            'Checksum' => md5('T'
                            .'SB_islamicrelief'
                            .'ISLAMICRELIEF'
                            .'4012888888881881'
                            .'101'
                            .'MYR'
                            .'100.00'
                            .'d19893d3d53e6479a391cfe40a3ed88d'),
                        );

$params_in_molpay_format = $params["RecordType"]
                        ."|".$params["MerchantID"]
                        ."|".$params["SubMerchant"]
                        ."|".$params["Token"]
                        ."|".$params["OrderID"]
                        ."|".$params["Currency"]
                        ."|".$params["Amount"]
                        ."|".$params["BillingName"]
                        ."|".$params["BillingEmail"]
                        ."|".$params["BillingMobile"]
                        ."|".$params["BillingDescription"]
                        ."|".$params["Checksum"];

$params_final = [
    $params_in_molpay_format,
];

$URL = 'https://sandbox.molpay.com/MOLPay/API/Recurring/input_v3.php';

$ch = curl_init();
                        curl_setopt($ch, CURLOPT_POST , TRUE );
                        curl_setopt($ch, CURLOPT_POSTFIELDS , http_build_query($params_final));
                        curl_setopt($ch, CURLOPT_URL , $URL );
                        curl_setopt($ch, CURLOPT_HEADER , TRUE );
                        curl_setopt($ch, CURLINFO_HEADER_OUT , TRUE );
                        curl_setopt($ch, CURLOPT_RETURNTRANSFER , TRUE );
                        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER , FALSE);
                        $result = curl_exec( $ch );
                        $curl_error = curl_error($ch);
                        curl_close( $ch );