Ionic angular project

Need to develop Spa and Salon Booking and payment application with API, SQL lite Database for IOS Appstore and google play store etc. Database Design and Need to connect API connection and SQL lite database to save the Items Booked and paid. Project 01. Mobile application Google Play (submission) Apple App Store(submission) =========================================== project 2. Same as Mobile application for windows UI browser Project =========================================== Details for both the project. The central SQL Server must control: • appointment availability • staff availability • booking numbers • payment confirmation (Card Gateway multiple, Stripe, PayPal, Google pay etc) • double-booking prevention • cancellation • refunds (Card Gateway multiple, Stripe, PayPal, Google pay etc) This is especially important because two customers could try to book the same staff/time simultaneously 1. Customer Application Modules 1.1 Splash Screen Display: • Logo • Company name • Application version • Loading indicator 2. Customer Registration Customer can register using: • Mobile number • Email • Password • OTP 3.Login Mobile / Email, Password, Forgot Password, Login 4. Mobile UI Develop: Splash, Login, Registration, Home, Services, Service Details, Staff, Calendar, Time Slots, Cart, Checkout, Payment, Confirmation, My Bookings, Profile 5.SQLite Create local database: Customer, Services, Cart, Booking, Booking Detail, Payment, Sync Queue 6.API Develop: Authentication, Services, Staff, Availability, Booking, Payment, Customer, Promotion 7.API Endpoints A complete initial API could include: AUTH POST /api/auth/register POST /api/auth/login POST /api/auth/refresh POST /api/auth/forgot-password POST /api/auth/verify-otp 8.Notifications: Email, SMS 9.Testing Test: Booking, Single service, Multiple services, Multiple staff, Different durations, Unavailable staff, Staff leave, Holiday, Branch closing. 10.Payment Integrate selected payment gateway. Test: Successful payment, Failed payment, Cancelled payment, Timeout, Duplicate payment Refund, Partial refund.