Paul Paul - 1 month ago 15
PHP Question

PayPal IPN verified handshake but Invalid IPN

I'm having trouble using my "old" PayPal IPN code.
When I use the PayPal IPN Simulator I get the message

IPN was sent and the handshake was verified.
but in my log I can see that the IPN message is
Invalid


I already checked the following:


  • Server supports SHA2 and has SHA2 SSL certificate

  • IPN is activated for the merchant account

  • IPN URL is correct

  • PayPal button language encoding set to UTF-8



Code I use

define("DEBUG", true);
define("USE_SANDBOX", 1);

$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$myPost = array();

foreach ($raw_post_array as $keyval) {
$keyval = explode ('=', $keyval);
if (count($keyval) == 2)
$myPost[$keyval[0]] = urldecode($keyval[1]);
}

$req = 'cmd=_notify-validate';

if(function_exists('get_magic_quotes_gpc')) {
$get_magic_quotes_exists = true;
}

foreach ($myPost as $key => $value) {
if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) {
$value = urlencode(stripslashes($value));
} else {
$value = urlencode($value);
}
$req .= "&$key=$value";
}

if(USE_SANDBOX == true) {
$paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
} else {
$paypal_url = "https://www.paypal.com/cgi-bin/webscr";
}

$ch = curl_init($paypal_url);

if ($ch == FALSE) {
return FALSE;
}

curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);

if(DEBUG == true) {
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, 1);
}

//si depronto se usa proxy eliminar los //
//curl_setopt($ch, CURLOPT_PROXY, $proxy);
//curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);

//se coloca el tiempo maximo que se demora este script
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));

$res = curl_exec($ch);

if (curl_errno($ch) != 0) // cURL error
{
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "No se puede conectar a PayPal para validar el IPN: " . curl_error($ch) . PHP_EOL, 3, LOG_FILE);
}
curl_close($ch);
exit;
} else {
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "HTTP response:". curl_getinfo($ch, CURLINFO_HEADER_OUT) ." over IPN: $req" . PHP_EOL, 3, LOG_FILE);
error_log(date('[Y-m-d H:i e] '). "HTTP respnse a la validacion: $res" . PHP_EOL, 3, LOG_FILE);
}
curl_close($ch);
}

$tokens = explode("\r\n\r\n", trim($res));
$res = trim(end($tokens));

if (strcmp ($res, "VERIFIED") == 0) {
//$item_name = $_POST['item_name'];
//$item_number = $_POST['item_number'];
//$payment_status = $_POST['payment_status'];
//$payment_amount = $_POST['mc_gross'];
//$payment_currency = $_POST['mc_currency'];
//$txn_id = $_POST['txn_id'];
//$receiver_email = $_POST['receiver_email'];
//$payer_email = $_POST['payer_email'];

$txt = fopen("paypalLog.txt", "a+");

ob_start();
var_dump($_POST);
$result = ob_get_clean();

fputs($txt, $result);
@fclose($fp);
//fin

// crea el LOG
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "IPN Verification: $req ". PHP_EOL, 3, LOG_FILE);
}
} else if (strcmp ($res, "INVALID") == 0) {
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "IPN Validation: $req" . PHP_EOL, 3, LOG_FILE);
}
}


Log file

[2016-10-09 09:49 Europe/Berlin] HTTP response:POST /cgi-bin/webscr HTTP/1.1

Host: www.sandbox.paypal.com

Accept: */*

Connection: Close

Content-Length: 938

Content-Type: application/x-www-form-urlencoded



over IPN: cmd=_notify-validate&payment_type=instant&payment_date=Sun+Oct+09+2016+09%3A43%3A26+GMT+0200+%28Mitteleurop%E4ische+Sommerzeit%29&payment_status=Completed&address_status=confirmed&payer_status=verified&first_name=John&last_name=Smith&payer_email=buyer%40paypalsandbox.com&payer_id=TESTBUYERID01&address_name=John+Smith&address_country=United+States&address_country_code=US&address_zip=95131&address_state=CA&address_city=San+Jose&address_street=123+any+street&business=seller%40paypalsandbox.com&receiver_email=seller%40paypalsandbox.com&receiver_id=seller%40paypalsandbox.com&residence_country=US&item_name1=something&item_number1=AK-1234&tax=2.02&mc_currency=USD&mc_fee=0.44&mc_gross=12.34&mc_gross_1=12.34&mc_handling=2.06&mc_handling1=1.67&mc_shipping=3.02&mc_shipping1=1.02&txn_type=cart&txn_id=911158411&notify_version=2.1&custom=xyz123&invoice=abc1234&test_ipn=1&verify_sign=AFcWxV21C7fd0v3bYYYRCpSSRl31Abb2NUi36uV.Fg6Hd45FbjL
[2016-10-09 09:49 Europe/Berlin] HTTP respnse a la validacion: HTTP/1.1 200 OK

Date: Sun, 09 Oct 2016 07:49:50 GMT

Server: Apache

X-Frame-Options: SAMEORIGIN

Set-Cookie: c9MWDuvPtT9GIMyPc3jwol1VSlO=0UL2ykO4iVuB1THqg4V_A1yKQujjM6s4YtickDFcjh59dGheER5gsdGdmZZCbEMgaMmN3I_R2w7FGJZfAT-b-iu--TRNYPmz3sNcg65cP4NX_3N8vLL5YRk_wP4ng3sV9Z3McJOb8ZG0zTMTQXFAqNee8dS5HvEPSBGxiANK5LjhfcvpbotfTs4OUc-IpsuB3DouU2MaWlABlVdH733KqBHIIPLGrxy9USjIiaf5DS3KhJ-i0RwH3PVy0DOAr0_dWjahWdwr9ulHq11ZhUpD8S6lntr6iZtHNNGZblK_SH-RAA__EZe29-pw1HQAqu-R5-VY0ff9-oEgHfWUB8DzzsAg3dtF2us-ucVhShoSDJcm_ScOgU62vaFkuC1BLEbDJgs0NG9U3NngCZQo59X_7MrfOON8ofxREAKK1yaqdxpI9gWFz1Jrzcbe8KzW; domain=.paypal.com; path=/; Secure; HttpOnly

Set-Cookie: cookie_check=yes; expires=Wed, 07-Oct-2026 07:49:51 GMT; domain=.paypal.com; path=/; Secure; HttpOnly

Set-Cookie: navcmd=_notify-validate; domain=.paypal.com; path=/; Secure; HttpOnly

Set-Cookie: navlns=0.0; expires=Tue, 09-Oct-2018 07:49:51 GMT; domain=.paypal.com; path=/; Secure; HttpOnly

Set-Cookie: Apache=10.42.101.60.1356986390240295; path=/; expires=Tue, 02-Oct-46 07:49:50 GMT

Vary: Accept-Encoding,User-Agent

Connection: close

HTTP_X_PP_AZ_LOCATOR: sandbox.slc

Paypal-Debug-Id: beb3b1rt5fd1

Set-Cookie: X-PP-SILOVER=name%3DSANDBOX3.WEB.1%26silo_version%3D1880%26app%3Dappdispatcher%26TIME%3D2666985815%26HTTP_X_PP_AZ_LOCATOR%3Dsandbox.slc; Expires=Sun, 09 Oct 2016 08:19:51 GMT; domain=.paypal.com; path=/; Secure; HttpOnly

Set-Cookie: X-PP-SILOVER=; Expires=Thu, 01 Jan 1970 00:00:01 GMT

Strict-Transport-Security: max-age=14400

Transfer-Encoding: chunked

Content-Type: text/html; charset=UTF-8



INVALID
[2016-10-09 09:49 Europe/Berlin] IPN Invalido: cmd=_notify-validate&payment_type=instant&payment_date=Sun+Oct+09+2016+09%3A43%3A26+GMT+0200+%28Mitteleurop%E4ische+Sommerzeit%29&payment_status=Completed&address_status=confirmed&payer_status=verified&first_name=John&last_name=Smith&payer_email=buyer%40paypalsandbox.com&payer_id=TESTBUYERID01&address_name=John+Smith&address_country=United+States&address_country_code=US&address_zip=95131&address_state=CA&address_city=San+Jose&address_street=123+any+street&business=seller%40paypalsandbox.com&receiver_email=seller%40paypalsandbox.com&receiver_id=seller%40paypalsandbox.com&residence_country=US&item_name1=something&item_number1=AK-1234&tax=2.02&mc_currency=USD&mc_fee=0.44&mc_gross=12.34&mc_gross_1=12.34&mc_handling=2.06&mc_handling1=1.67&mc_shipping=3.02&mc_shipping1=1.02&txn_type=cart&txn_id=911158411&notify_version=2.1&custom=xyz123&invoice=abc1234&test_ipn=1&verify_sign=AFcWxV21C7fd0v3bYYYRCpSSRl31Abb2NUi36uV.Fg6Hd45FbjL

Answer

Finally fixed the problem. There are a few things that need to be obeserved when using the PayPal Sandbox:

  • When you use the PayPal IPN Simulator, the response you get will always be Invalid.
  • The PayPal Sandbox IPN Response can be delayed by minutes (not only seconds) so it's important to wait a bit to see if there is a response incoming or not.
  • For some reasons, PayPal Sandbox doesn't deliver a response, if the PayPal Sandbox Account has the exact same mail adresse as the real PayPal account.

By considering the indicated things above, I've fixed my problem. Hope this will help someone else as well.

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