As all orders are placed and paid online and picked up offline, when an order is placed, a three-digit pick-up number and a QR code will be generated to facilitate the in store pick up. Some may have observed that the three-digit pick-up number appears sequential within each store in a day and shared by both pick-up and delivery orders; and use it as a barometer to track the daily order volume of a store by placing orders at both opening and close time of the store.