use Data::Dumper;

my $h1 =  {  'location_setting' => [ '409' ], 'status' => [ '501' ] };

my $h2 = {  'status' => [ '137', '124' ], 'location_setting' => ['405'], 'classification' => ['0']}; 

my $x = {%$h1, %$h2};

print Dumper $x;

 Output
-----------
$VAR1 = {
          'classification' => [
                                '0'
                              ],
          'location_setting' => [],
          'status' => [
                        '137',
                        '124'
                      ]
        };