PayPal Sandbox testing continuously provides the following error:
http 400 – Bad Request Your browser sent a request that this server could not understand.
I am using the git provided sample code from PayPal and am unable to get around this error.
Code [PayPalIPN.php]
<?php
class PaypalIPN
{
/** @var bool Indicates if the sandbox endpoint is used. */
private $use_sandbox = false;
/** @var bool Indicates if the local certificates are used. */
private $use_local_certs = true;
/** Production Postback URL */
const VERIFY_URI = 'https://ipnpb.paypal.com/cgi-bin/webscr';
/** Sandbox Postback URL */
const SANDBOX_VERIFY_URI = 'https://ipnpb.sandbox.paypal.com/cgi-bin/webscr';
/** Response from PayPal indicating validation was successful */
const VALID = 'VERIFIED';
/** Response from PayPal indicating validation failed */
const INVALID = 'INVALID';
/**
* Sets the IPN verification to sandbox mode (for use when testing,
* should not be enabled in production).
* @return void
*/
public function useSandbox()
{
$this->use_sandbox = true;
}
/**
* Sets curl to use php curl's built in certs (may be required in some
* environments).
* @return void
*/
public function usePHPCerts()
{
$this->use_local_certs = false;
}
/**
* Determine endpoint to post the verification data to.
*
* @return string
*/
public function getPaypalUri()
{
if ($this->use_sandbox) {
return self::SANDBOX_VERIFY_URI;
} else {
return self::VERIFY_URI;
}
}
/**
* Verification Function
* Sends the incoming post data back to PayPal using the cURL library.
*
* @return bool
* @throws Exception
*/
public function verifyIPN()
{
if ( ! count($_POST)) {
throw new Exception("Missing POST Data");
}
$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) {
// Since we do not want the plus in the datetime string to be encoded to a space, we manually encode it.
if ($keyval[0] === 'payment_date') {
if (substr_count($keyval[1], '+') === 1) {
$keyval[1] = str_replace('+', '%2B', $keyval[1]);
}
}
$myPost[$keyval[0]] = urldecode($keyval[1]);
}
}
// Build the body of the verification post request, adding the _notify-validate command.
$req = 'cmd=_notify-validate';
$get_magic_quotes_exists = false;
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";
}
// Post the data back to PayPal, using curl. Throw exceptions if errors occur.
$ch = curl_init($this->getPaypalUri());
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_SSLVERSION, 6);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
// This is often required if the server is missing a global cert bundle, or is using an outdated one.
if ($this->use_local_certs) {
curl_setopt($ch, CURLOPT_CAINFO, __DIR__ . "/cert/cacert.pem");
}
curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'User-Agent: PHP-IPN-Verification-Script',
'Connection: Close',
));
$res = curl_exec($ch);
if ( ! ($res)) {
$errno = curl_errno($ch);
$errstr = curl_error($ch);
curl_close($ch);
throw new Exception("cURL error: [$errno] $errstr");
}
$info = curl_getinfo($ch);
$http_code = $info['http_code'];
if ($http_code != 200) {
throw new Exception("PayPal responded with http code $http_code");
}
curl_close($ch);
// Check if PayPal verifies the IPN data, and if so, return true.
if ($res == self::VALID) {
return true;
} else {
return false;
}
}
}
?>
Code [PaypalListener.php]
<?php namespace Listener;
require('PaypalIPN.php');
use PaypalIPN;
$ipn = new PaypalIPN();
// Use the sandbox endpoint during testing.
$ipn->useSandbox();
$verified = $ipn->verifyIPN();
if ($verified) {
/*
* Process IPN
* A list of variables is available here:
* https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/
*/
}
// Reply with an empty 200 response to indicate to paypal the IPN was received correctly.
header("HTTP/1.1 200 OK");
?>
When using PayPals IPN Simulator, the following data gets posted to the PayPalIPN page:
payment_type=instant&payment_date=14%3A37%3A40%20Aug%2004%2C%202021%20PDT&payment_status=Completed&address_status=confirmed&payer_status=verified&first_name=John&last_name=Smith&payer_email=buyer@paypalsandbox.com&payer_id=TESTBUYERID01&address_name=John%20Smith&address_country=United%20States&address_country_code=US&address_zip=95131&address_state=CA&address_city=San%20Jose&address_street=123%20any%20street&business=seller@paypalsandbox.com&receiver_email=seller@paypalsandbox.com&receiver_id=seller@paypalsandbox.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=746114854¬ify_version=2.1&custom=xyz123&invoice=abc1234&test_ipn=1&verify_sign=AqXxBxXlRxzzzTc3OqYNzyZnI8SaAdBMjOvZCSXfOj1cWp11HHkIrMRX
And the $req returned data (that should be being sent back to PayPal) turns out as:
cmd=_notify-validate&payment_type=instant&payment_date=14%3A37%3A40+Aug+04%2C+2021+PDT&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=746114854¬ify_version=2.1&custom=xyz123&invoice=abc1234&test_ipn=1&verify_sign=AqXxBxXlRxzzzTc3OqYNzyZnI8SaAdBMjOvZCSXfOj1cWp11HHkIrMRX
I noticed in the return encode, the “+” symbols were originally %20 and the “@” symbols have been replaced with %40, I have replaced these to match the original code received but with no luck in any change of error.
I am unable to find a solution to this problem on PayPal forums nor otherwise. What am I missing? Please help!
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Answer
This issue is related to PayPal’s recent sandbox migration to the cloud. For now, change the verification postback hostname from ipnpb to www:
const SANDBOX_VERIFY_URI = 'https://www.sandbox.paypal.com/cgi-bin/webscr';