Php 加密贝宝按钮

我动态加密我的Paypal按钮，但当点击“订阅”按钮时，我从Paypal收到一个错误：“调度错误，请查看日志文件以了解更多信息”

我用于生成按钮的代码：

<form id="suf" onsubmit="return newUser();" action="<?php echo $PPBtnURL; ?>" method="POST">
    <?php
        $form = array();
        $form['business']=$PPbtnUser;
        $form['itemname']=$_POST['item_name'];
        $form['itemnumber']=$_POST['item_number'];
        $form['currency_code']="USD";
        $skip_a2 = ($res['a2'] <= $res['a1']);
        foreach($res as $k=>$v){
            if($skip_a2 && ($k == "a2" || $k=="p2" || $k=="t2")){continue;}
            if($k == "trial1" || $k == "trial2"){continue;} 
            $form[$k]=$v;                                   
        }
        $form['src']=1;
        $form['rm']=2;
        $form['return']="https://www.mysite.com/signup2.php";
        $form['cancel_return']="https://www.mysite.com/";
        $form['bname']=$_POST['bname'];
        $form['fname']=$_POST['fname'];
        $form['lname']=$_POST['lname'];                         
        $form['pwone']=$_POST['pwone'];
        $form['pwtwo']=$_POST['pwtwo'];

        $encrypted = paypal_encrypt($form); 

        function paypal_encrypt($hash){
            global $MY_KEY_FILE;
            global $MY_CERT_FILE;
            global $PAYPAL_CERT_FILE;
            global $OPENSSL;

            // private key file to use
            $MY_KEY_FILE = "/home/mysite/mysite.com/prvkey.pem";
            // public certificate file to use
            $MY_CERT_FILE = "/home/mysite/mysite.com/a62ecbe3015a2165c8859b953753038a-pubcert.pem";
            // Paypal's public certificate
            $PAYPAL_CERT_FILE = "/home/mysite/mysite.com/paypal_cert.pem";
            // path to the openssl binary
            $OPENSSL = "/usr/bin/openssl";

            if (!file_exists($MY_KEY_FILE)) {
                echo "ERROR: MY_KEY_FILE $MY_KEY_FILE not found\n";
            }
            if (!file_exists($MY_CERT_FILE)) {
                echo "ERROR: MY_CERT_FILE $MY_CERT_FILE not found\n";
            }
            if (!file_exists($PAYPAL_CERT_FILE)) {
                echo "ERROR: PAYPAL_CERT_FILE $PAYPAL_CERT_FILE not found\n";
            }

            //Assign Build Notation for PayPal Support
            $hash['bn']= 'StellarWebSolutions.PHP_EWP2';

            $data = "";
            foreach ($hash as $key => $value) {
                if ($value != "") {
                    $data .= "$key=$value\n";
                }
            }
            $openssl_cmd = "($OPENSSL smime -sign -signer $MY_CERT_FILE -inkey $MY_KEY_FILE " .
                "-outform der -nodetach -binary <<_EOF_\n$data\n_EOF_\n) | " .
                "$OPENSSL smime -encrypt -des3 -binary -outform pem $PAYPAL_CERT_FILE";
            exec($openssl_cmd, $output, $error);
            if(!$error){
                return implode("\n",$output);
            }else{
                return "ERROR: encryption failed";
            }
        };
    ?>
    <input type="hidden" name="cmd" value="_s-xclick">
    <input type="hidden" name="encrypted" value="<?PHP echo $encrypted; ?>">
    <input type="image" src="https://www.sandbox.paypal.com/en_US/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
    <img alt="" border="0" src="https://www.sandbox.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>

---

现在有点晚了，但如果有帮助的话：在学习了相同的教程之后，我遇到了相同的错误，尽管我看不出您代码中的问题，但我发现只要$form中有paypal_encrypt（）不喜欢的内容，我就会遇到这个错误

tl；dr:$form中的无效数据可能会触发此“有用”错误

另外，请注意，您正在将数据从$\u POST直接传递到$openssl\u cmd，而不转义它。
哪个服务器日志？正如我所说，我的ipn日志中没有任何内容，php中也没有任何内容。此外，paypal如何访问我服务器上的任何日志？