At the IPN Simulator page I enter a valid URL in the IPN handler URL field and I select Express Checkout in the Transaction Type field. An input form should appear but none does. The URL is https://mysite.org/cgi-bin/paypal_listener.php If I place the cursor after the URL and hit Enter I get the message"IPN was not sent, and the handshake was not verified. Review your information" Happens on Chrome and Firefox. I don't see this problem addressed on Stack Overflow or Reddit or anywhere. Any ideas on how I can get the form to appear? Thanks!
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