use strict;
use warnings;
use WordPress::XMLRPC;

	my $wp = WordPress::XMLRPC->new({
    username => '...',
    password => '...',
    proxy => 'http://.../blog/xmlrpc.php',
  });

  $wp->server or die;

  my $xx = $wp->getCategories();
  print STDERR $wp->errstr if $wp->errstr;
  
  use Data::Dumper;
  die Dumper( $wp );