I Built a simple payment system integrating paypal with wordpress in php basically I build a list where each list item retrieves metadata from a specific page in wordress (a page for every product) and with this data build dynamically an "add to cart" paypal button. this worked fine! but.. Then I tried to encrypt the "add to cart" button for obvious reasons. I found a php program thats supposed to do that (and from what I see in different internet forums - most of the time delivers to this promise) , and I think I followed all of paypal instructions with the certificate (private, public, paypals etc..)
While I don't get any error from the html page - when I push the add to cart button I get a paypal error: "We have detected a problem with this shopping cart. If the problem persists, please contact the merchant." but I don't have any details why and what I'm doing wrong..
I have a merchant account with paypal.
In order to remove unnecessary clutter and noise I built a test page with static data to check if the button works right and here it is: glad for any help
the basic test page:
<?php
include_once "testfunctions.php";
//inserting some test data
$themetacost='100';
$themetaname="testbook";
$themetashipping='20';
//building the paypal button
$line='';
$line.='<form target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_blank" id="payform" >
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="encrypted" value="';
$line.= buildbutton($themetacost,$themetaname,$themetashipping);
$line.='">';
$line.='<input type="image" src="https://www.paypalobjects.com/WEBSCR-640-20110429-1/he_IL/i/btn/btn_cart_SM.gif" border="0" name="submit" alt="PayPal - הדרך הקלה והבטוחה לשלם באופן מקוון!">
<img alt="" border="0" src="https://www.paypalobjects.com/WEBSCR-640-20110429-1/he_IL/i/scr/pixel.gif" width="1" height="1">
</form><br/>';
echo $line;
?>
the php buildbutton and encrypting functions:
<?php
function buildbutton($amount,$bname,$shipping) {
//Sample PayPal Button Encryption: Copyright 2006-2010 StellarWebSolutions.com
//Not for resale - license agreement at
//http://www.stellarwebsolutions.com/en/eula.php
//Updated: 2010 02 01
$form = array('cmd' => '_cart',
'business' => 'X@XXX.CO.il', // changed from the original
'cert_id' => 'XXXXXXXXXXX',// changed from the original
'shipping' => $shipping,
//'invoice' => '', //check what this is
'currency_code' => 'ILS',
//'no_shipping' => '0', //refers to shipping address
'add'=>'1',
'item_name' => $bname,
'amount' => $amount
);
$encrypted = paypal_encrypt($form);
return $encrypted;
}
function paypal_encrypt($hash)
{
//Sample PayPal Button Encryption: Copyright 2006-2010 StellarWebSolutions.com
//Not for resale - license agreement at
//http://www.stellarwebsolutions.com/en/eula.php
# private key file to use //
$MY_KEY_FILE = "/home/paypal/my-prvkey.pem";
# public certificate file to use
$MY_CERT_FILE = "/home/paypal/my-prvkey.pem";//
# Paypal's public certificate
$PAYPAL_CERT_FILE = "/home/paypal/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 $PAYPAL_CERT_FILE not found\n";
}
if (!file_exists($OPENSSL)){
echo "error with openssl $OPENSSL not found \n";
}
//Assign Build Notation for PayPal Support
//$hash['bn']= 'StellarWebSolutions.PHP_EWP2'; //this is not needed cause i dont have a ewp
$data = "";
foreach ($hash as $key => $value) {
if ($value != "") {
//echo "Adding to blob: $key=$value\n";
$data .= "$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";
}
}
?>
I tried to change the variables to numbers to check if the problem is there that didn't help.
and this is how the encrypted test page source looks like:
action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_blank" id="payform" >
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="encrypted" value="-----BEGIN PKCS7-----
MIIBdwYJKoZIhvcNAQcDoIIBaDCCAWQCAQAxggEwMIIBLAIBADCBlDCBjjELMAkG
A1UEBhMCVVMxCzAJBgNVBAgTAkNBMRYwFAYDVQQHEw1Nb3VudGFpbiBWaWV3MRQw
EgYDVQQKEwtQYXlQYWwgSW5jLjETMBEGA1UECxQKbGl2ZV9jZXJ0czERMA8GA1UE
AxQIbGl2ZV9hcGkxHDAaBgkqhkiG9w0BCQEWDXJlQHBheXBhbC5jb20CAQAwDQYJ
KoZIhvcNAQEBBQAEgYAiFKR0WuQJcr6cQZvDCptQeDNyfipH9pDy1Q58C+ITCZWY
XRkkUOvvL3jniO1GUxsY2JleGAdZWSV1qgnO3uNjj0V3Z0AxbrAiuA0lLd8pscBT
MM+9+1RwjTOUVtOi3PASy1TC4hk6Wq01KUk1DCpbqMtqBZ6sWb5jHRxWqbL08zAr
BgkqhkiG9w0BBwEwFAYIKoZIhvcNAwcECClgCVLJPeXAgAgr8wXDhqI+og==
-----END PKCS7-----"><input type="image" src="https://www.paypalobjects.com/WEBSCR-640-20110429-1/he_IL/i/btn/btn_cart_SM.gif" border="0" name="submit" alt="PayPal - äãøê ä÷ìä åäáèåçä ìùìí áàåôï î÷ååï!">
<img alt="" border="0" src="https://www.paypalobjects.com/WEBSCR-640-20110429-1/he_IL/i/scr/pixel.gif" width="1" height="1">
</form><br/>
edit:after changing in the html form (not! the php encrypt function) from '_cart' to '_s-xclick' I get a different error:
The email address for the business is not present in the encrypted blob. Please contact your merchant.
following more advice in various paypal forums I also tried to renew the certificates and keys (all three of them..). didn't help at all!
