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

Job ID: 33670500

Budget: $8 – $15 USD

we are trying to simulate Paypal IPN.
the is it saying " IPN was not sent, and the handshake was not verified. Review your information.
do you know how to solve this problem ?

Related categories: Linux PayPal API Apache Nginx Plesk