Thanks i have solve it using the following:
SELECT orders.id, orders.payment, orders.date, orders.status,
SUM(orderitems.price * orderitems.quantity) total_price,
GROUP_CONCAT(products.product SEPARATOR '<br>')productBy
FROM orders, orderitems, products
WHERE orderitems.orderID = orders.id AND products.productID = orderitems.productID
GROUP BY orders.id, orders.payment, orders.date ORDER BY orders.id DESC