Parking management system - open to bidding

I want to develop a web and mobile app for parking reservation and management. on this app the customer will be able to pay for parking without having to go to a ticket machine. This helps make it more efficient and easier to pay for parking and can be done so hours in advance. customer will pay by mobile payment or paypal or other PG by using a debit or credit card. What can you do on the app: Pay for parking online Reserve a parking space Check how much time you have left on your parking Cancel your ticket or postpone it for another date The app will send a 10 min warning that the ticket is running out The app itself will be in sync with the Parking Wardens devices and he will be able to tell who has and has not paid online. He will also know if a car is wrongfully parked in a reserved car space. USP - 1. search and reserve car parking buy mobile /web app.. 2. extend time before 20 min . 3. confirmation and update via SMS alert also . 4. payment by CC , DC , paypal and mobile vallet . - UI should be user friendly and easy to navigate , fast . for more detail pls ping