public function get_total_tax_refunded() {
		$cache_key   = WC_Cache_Helper::get_cache_prefix( 'orders' ) . 'total_tax_refunded' . $this->get_id();
		$cached_data = wp_cache_get( $cache_key, $this->cache_group );

		if ( false !== $cached_data ) {
			return $cached_data;
		}

		$total_refunded = $this->data_store->get_total_tax_refunded( $this );

		wp_cache_set( $cache_key, $total_refunded, $this->cache_group );

		return $total_refunded;
	}