DI customer app - repost

We have a new mobile app to be developed [automotive app for a car dealership]. This app will connect to an existing web-based system and will provide the customer with the ability to schedule/modify appointments, check work history, pay his invoices and receive info from various departments [sales, service, parts]. Number of screens in total [10-15] - dashboard, parts, sales, service, appointments, work order history, customer profile, vehicle profile, notifications, promotions.