my $mech = WWW::Mechanize->new();
$mech->agent_alias( 'Firefox' );
$mech->get( "https://login.binck.nl/klanten/Login.aspx?ReturnUrl=%2fklanten%2fdefault.aspx" );
$mech->submit_form(
    form_number => 2,
    fields => {
        userid => "$userid",
        password => "$password"
    },
    button => "btnSignon"
);