/**
* Validate IPN Message
* PayPal provides a simple solution for notifying us when a payment has been processed;
* they call it Instant Payment Notifications (IPN). In order to take advantage of IPN,
* we create an IPN listener for our application (see https://github.com/Quixotix/PHP-PayPal-IPN).
* See also https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNandPDTVariables/
* @return boolean whether ipn was validates
*/
public function validateIPN()
{
$listener = new IpnListener();
$listener->use_sandbox = !$this->apiLive;
if ($listener->processIpn()) {
if (Yii::app()->request->getPost('receiver_email') != $this->receiverEmail) {
$this->errorCode = self::ERROR_PROCESS_IPN;
$this->errorMessage = 'PayPal recurring payment receiver email mismatch';
return false;
} else {
return true;
}
} else {
$this->errorCode = self::ERROR_VERIFY_IPN;
$this->errorMessage = var_export($listener->getErrors(), true);
return false;
}
}