I regularly pay with Vancouver's pay by phone app. However, i have noticed that once in a while, the change in license plate (i have two vehicles) does not register. SO teh other day, I paid for parking and all was good, except it in fact did not register the change so I parked my other license plate. Sure enough, I got a ticket. However, I looked up teh bylaw and it does not state that license plate must match the app...