public function set_items_from_order( $order ) {
		$this->items     = array();
		$this->discounts = array();

		if ( ! is_a( $order, 'WC_Order' ) ) {
			return;
		}

		$this->object = $order;

		foreach ( $order->get_items() as $order_item ) {
			$item           = new stdClass();
			$item->key      = $order_item->get_id();
			$item->object   = $order_item;
			$item->product  = $order_item->get_product();
			$item->quantity = $order_item->get_quantity();
			$item->price    = wc_add_number_precision_deep( $order_item->get_subtotal() );

			if ( $order->get_prices_include_tax() ) {
				$item->price += wc_add_number_precision_deep( $order_item->get_subtotal_tax() );
			}

			$this->items[ $order_item->get_id() ] = $item;
		}

		uasort( $this->items, array( $this, 'sort_by_price' ) );
	}