Woocoomerce: pull total with ajax

gistfile1.php

// Add an extra key + value
add_filter('add_to_cart_fragments', 'woocommerce_header_add_to_cart_fragment');
function woocommerce_header_add_to_cart_fragment( $fragments ) {
  global $woocommerce;
  ob_start();
  ?>
  <div class="total"> <?php echo $woocommerce->cart->get_cart_total(); ?> </div>
  <?php
  $fragments['total'] = ob_get_clean();
  return $fragments;
}
 
// Create ajax callback function function
 
your_php_ajax_function(){
  $ajax = new WC_AJAX();
  $ajax->get_refreshed_fragments( );
}
 
// Get json data
jQuery.ajax({
  type:'POST',
  url: '/wp-admin/admin-ajax.php',
  data: use_points_processing,
  success:function(data){
  console.log(data.fragments.total); }
});