SOAP::Transport::HTTP::Client::send_receive: 500 (Internal Server Error) configure certs failed: failed to load /usr/local/certs/staging.cer: 

##</code><code>##

$ENV{HTTPS_CERT_FILE}= '/usr/local/certs/staging.cer';
$ENV{HTTPS_KEY_FILE}  = '/usr/local/certs/staging.pfx';
use XML::Simple;
use SOAP::Lite +trace; 

my $data = SOAP::Data->name('data' => "$xml")->type('string')->uri('');

my $s = SOAP::Lite
-> uri ('http://my.site.com/SoapService')
-> proxy ('https://stagingdi.site.com/SoapService/SoapService.asmx')
-> on_action(sub{join '/', @_})
-> on_fault(sub{});

$result = $s->PerformUpdate($data)->result;