function myplugin_register_settings() {
   add_option( 'myplugin_option_name', 'This is my option value.');
   register_setting( 'myplugin_options_group', 'myplugin_option_name', 'myplugin_callback' );
}
add_action( 'admin_init', 'myplugin_register_settings' );

function myplugin_register_options_page() {
  add_options_page('Page Title', 'Plugin Menu', 'manage_options', 'myplugin', 'myplugin_options_page');
}
add_action('admin_menu', 'myplugin_register_options_page');

function myplugin_options_page()
{
?>
  <div>
  <?php screen_icon(); ?>
  <h2>ID Settings</h2>
  <form method="post" action="options.php">
  <?php settings_fields( 'myplugin_options_group' ); ?>
  <h3>Set Store ID</h3>
  <p>Please enter the store id given to you by the publisher</p>
  <table>
  <tr valign="top">
  <th scope="row"><label for="myplugin_option_name">StoreID</label></th>
  <td><input type="text" id="myplugin_option_name" name="myplugin_option_name" value="<?php echo get_option('myplugin_option_name'); ?>" /></td>
  </tr>
  </table>
  <?php  submit_button(); ?>
  </form>
  </div>
<?php
}

global $product;
  $category = 'excludecat';
      if ( has_term( $category, 'product_cat', $product->id ) )
}

add_action( 'woocommerce_product_meta_start', 'myplugin_value' );