my %opts = ( 'foo' => 'default_value',
             'bar' => 'another_default_value',
             'baz' => 'yet_another' ); 

GetOptions( \%opts, override, default, values, here);

My::Class->method( \%opts );

# ... elsewhere in your code ...

package My::Class;

  my $class    = shift;
  my $opts_ref = shift;

  ...

##</code><code>##

   'h|help'   => sub { help() },