Pay as you Go with Parking Apps

• Do I have to download the RingGo app?
• The RingGo app says I have an existing account but I have never used them before?
• What is the RingGo Convenience Fee?
• How do I pay for an outstanding balance with RingGo?
• Do I need to have internet data to use the RingGo app.
• How do I pay for my parking using the RingGo app?