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

Setting PayPal return URL and making it auto return?

You have to enable auto return in your PayPal account, otherwise it will ignore the return field. From the documentation (updated to reflect new layout Jan 2019): Auto Return is turned off by default. To turn on Auto Return: Log in to your PayPal account at https://www.paypal.com or https://www.sandbox.paypal.com The My Account Overview page appears. … Read more