Try using HTTP with the sandbox server.
change https://www.sandbox.paypal.com/cgi-bin/webscr to http://www.sandbox.paypal.com/cgi-bin/webscr
Update: and this my $ua = LWP::UserAgent->new(ssl_opts => { verify_hostname => 1 }); to this my $ua = LWP::UserAgent->new;
That would mean your SSL encryption was not right or PP could have sent it to you none HTTPS or the sandbox server does not run SSL or...

In reply to Re^4: How do you use Paypal IPN with Dancer2? by $h4X4_|=73}{
in thread How do you use Paypal IPN with Dancer2? by MorayJ

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