Paypal SandBox IPN always returns INVALID

Edit: Now that I can see the array you’ve outputted, try replacing this to get rid of the PHP array error: foreach ($_POST as $key => $value) { if (!is_array($value)) { $value = urlencode(stripslashes($value)); $req .= “&$key=$value”; } else if (is_array($value)) { $paymentArray = explode(‘ ‘, $value[0]); $paymentCurrency = urlencode(stripslashes($paymentArray[0])); $paymentGross = urlencode(stripslashes($paymentArray[1])); $req .= … Read more

IPN was not sent, and the handshake was not verified. Please review your information.

The handshake error is most likely to occur when your server/keystore config is non-compliant with the upgraded PayPal SSL encryption algorithms. IPN simulator will connect againest the PayPal Sandbox environment, which has been upgraded with Versign G5 root cert / SHA-2 encryption algorithms (btw this is an industry standard as supposed to be everywhere in … Read more