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Problem :

I am currently working with Expresscheckout on Paypal, For single time Users payment integration. Working flow 1st create a token and user redirect to paypal page and success to the return url page. 1.SetExpressCheckout 2. DoExpressCheckoutPayment

My Issue: 1.Now I need to set a ipn for this payment system. 2.My notify url is not working on a simulator. It gives error as(IPN was not sent, and the handshake was not verified. Please review your information.) 

I need some help for this is not set on my side. Please help me in resolving this issue.

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1 Answer

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Solution :

The handshake error is most likely to occur when the server/keystore config is non-compliant with a upgraded PayPal SSL encryption algorithms.

IPN simulator will connect againest a PayPal Sandbox environment, which has been upgraded with a Versign G5 root cert / SHA-2 encryption algorithms (Note: This is an industry standard as supposed to be everywhere in the 2016). Once your IPN host failed to meet a compliance, the SSL connnection will error out with a handshake problems.

Simply check the server by running a connection script against a PayPal sandbox endpoint like below:

openssl s_client -connect api-3t.sandbox.paypal.com:443 -showcerts -CApath /etc/ssl/certs/ 

If you were not getting the Verify return code: 0 (ok), you may have to check the cert/SHA-2 compatibility.

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