Please add the option to add tip after the order was delivered. I wanted to tip the rider after the delivery was made but couldn't do it. Who would be foolish to add tip when you are still ordering?! Also, you can see 20% off on shop and you try to order but no discount appears. There's not even an option to check how to avail the discount. The app was great but the platform used seems to be made by incompetent programmers.