Appointment System with Firebase Integration

I need a simple web application built with Node.js or Next.js that connects to Firebase for an appointment booking system. The app should display available services, let users select a service, enter a date and time, and save the appointment. When the appointment is due, it should send a mobile notification to the user. It should also trigger a ticket generation process through an existing API. The main goal is to create a reliable appointment system connected to Firebase and supporting notifications and API integrations.