View difference between Paste ID: b25iqnPh and Sx20PSCr

 <?php
 function custom_ajax_order_review_refresh_form_commerce_checkout_form_review_alter(&$form, &$form_state) {
   // give the form a custom callback
   $form['commerce_payment']['payment_method']['#ajax']['callback'] = "custom_ajax_order_review_refresh_custom_callback";
   // refresh the current order
   commerce_cart_order_refresh($form_state['order']);
 }
 
 function custom_ajax_order_review_refresh_custom_callback(&$form, $form_state) {
   // load the current order
   $order_id = $form_state['order']->order_id;
   $order = commerce_order_load($order_id);
   // set the newly selected payment option to the order
   $order->data['payment_method'] = $form['commerce_payment']['payment_method']['#default_value'];
   // refresh the current order (more specific: update it's line items
   commerce_cart_order_refresh($order);
   // save the refreshed order (more specific: recalculate the order total and save it)
   commerce_order_save($order);
   // define the ajax commands and refresh the targeted fieldsets
   $commands = array();
   $commands[] = ajax_command_replace('#payment-details', render($form['commerce_payment']['payment_details']));
   $commands[] = ajax_command_replace('.view-commerce-cart-summary', views_embed_view('commerce_cart_summary', 'default', $order_id));
   return array('#type' => 'ajax', '#commands' => $commands);
 }