Just tried to order from grub hub and selected to use a cash tip option. I got a call from grub hub stating that the only way they would process my order is if I selected the 15% prepaid tip option. In the past when I used the prepaid tip option the orders would be wrong or missing items. So I started doing the cash tip, that way when the order was wrong or incorrect I would tip someone for being incompetent. So they labeled me as a non-tipper and said that they are requiring me to select the 15% pre paid tip option or else they would cancel my order. Forcing me to pay even though the orders are continuously incorrect. This is robbery, since when is a tip mandatory?