What features should a good salon app development company include in their deliverables?

Hi everyone,
I’m about to hire a company for developing a salon booking and management app. Besides the usual features like booking and payments, what are some must-have functionalities or deliverables I should expect from a professional salon app development company? Any recommendations on what to insist on during development?

A good salon app development company should include features like online appointment booking, stylist profiles, service catalog with pricing, in-app payments, loyalty programs, push notifications for offers/reminders, and customer reviews/ratings. They should also ensure custom salon app development with user-friendly design, scalability, and secure data handling.