Aug 22, 2013 · The payments.php code (Line 60-64) has been slightly amended to fix the IPN Invalid Response. If you are not receiving the correct response from Paypal ensure that you are using the main test account (Verified Business Account) from your Paypal Sandbox account.
Sep 01, 2020 · In Paypal Standard payment gateway integration method we pass payment data via a standard payment form. With this form, we usually set the application endpoint to get the IPN and to callback after payment process. Sometimes, the process of receiving IPN from PayPal contains lack of reliability.
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