function paywall_form_alter(&$form, $form_state, $form_id) {
    // Normally a switch is used because you may want to alter more than
    // one form and it is easy to add a new case for each form.
    dpm($form);
    dpm($form_id);
    switch ($form_id) {
      // This is our form ID.
      case 'story_node_form':
        dpm('altering form');
        // Our kickin' mods go here.
        $form['paywall'] = array(
            '#type' => 'fieldset',
            '#title' => 'Paywall',
                );
          $form['paywall']['paywall_enabled'] = array(
            '#type' => 'checkbox',
            '#default_value' => '',
            '#title' => 'Paywall Enabled On This Node'
            );
        break;
    }
  }
?>