We have customers that like to place an online order pay with a card and dont leave a tip. Then leave in the common message "leave on front porch". It would be helpfull if no tip is left on a delivery order for a pop up to appear asking if they forgot to leave a tip or if they planned to leave a tip in cash. If they add a tip then nothing further. if they click plan to add a cash tip then it should notate that on the reciept.