Customer-Driver Transportation Services Android and ios App

I need a well-structured Android app that connects customer with our drivers for their transportation to appointments at our office in India. The app will have two user roles: Customer and Drivers.

Key Features:
- Customers will be able to book time slots for their pick-up.
- The app will also incorporate payment integration, allowing them to pay for their rides directly through the app.

Ideal Skills:
- Proficiency in Android app development.
- Experience in creating driver-customer transportation apps.
- Knowledge in integrating payment gateways into apps.

The app should also assist drivers with navigation using maps. Please ensure your bid reflects your understanding and capability of delivering this project.

Apart from this admin and manager roles need to incorporated for higher roles.