This was quite a while ago and I don't remember the details.

But here is a basic script that you can start with...

Warning: this code is adapted and untested.

use strict;
use warnings;

use SOAP::Lite +trace => "all";
use MIME::Base64 qw(encode_base64);

$ENV{HTTPS_DEBUG}     = 1;
$ENV{HTTPS_VERSION}   = '3';
$ENV{HTTPS_CERT_FILE} = 'C:/path/to/certificate.pem';

my $input_filename    = "test.pdf";
my $input_filepath    = "C:/path/$input_filename";

my $namespace         = "http://host/path";
my $method_name       = "MethodName";
my $soap_action       = "http://host/path/soap_action";
my $end_point         = "https://host/path/endpoint";

my $encoded_file      = '';
my $buffer            = '';
my $file_content      = '';

if (open(my $ifh, $input_filepath)) {
   
   binmode($ifh);
   $file_content      = do { local $/; <$ifh> };
   close($ifh);

} else {

   die "[Error] Could not open file - $input_filepath - $!";

}

$encoded_file         = encode_base64($file_content);
my $file_size         = -s $input_filepath;

my $soap              = SOAP::Lite
                          -> uri($soap_action)
                          -> on_action( sub { join '/', $namespace, $_
+[1] } )
                          -> proxy($end_point);

my $method            = SOAP::Data->name($method_name)
                          ->attr( { xmlns => $namespace });

my @params            = ( 
                         SOAP::Data->name("request"             => \SO
+AP::Data->value(
                              SOAP::Data->name("FileName"       => $in
+put_filename)->type("string"), 
                                   SOAP::Data->name("Filesize"  => $fi
+le_size)->type("int"), 
                                   SOAP::Data->name("Data"      => $en
+coded_file)->type("base64Binary")
                         )),
                          );
 
print $soap->call($method => @params)->result;
[download]