use WWW::Mechanize::GZip;
my $mech = WWW::Mechanize::GZip->new( ssl_opts => { SSL_verify_mode => 'SSL_VERIFY_NONE',verify_hostname => 0 } );
$url = 'https://test.com/signin';
$mech->get($url);

my ($csr_input) = $mech->find_all_inputs(name => 'form_token');
my $token = $csr_input->value();

$mech->form_number(1);
$mech->field('email',$username);
$mech->field('password',$password);
$mech->field('signin','');
$mech->field('form_id','signin');
$mech->field('form_token',$token);
$mech->field('button_clicked','');
$mech->submit();