Develop 'Ready Kart' App

I need an app called 'Ready Kart' that allows users to conveniently purchase cigarettes, snacks, and beverages. The app should be developed for both iOS and Android platforms and must prioritize user-friendliness for easy navigation and seamless transactions. This is a time-sensitive project, so I am looking to get it completed as soon as possible. Please ensure essential e-commerce features such as a secure payment gateway, inventory management, and user account functionality are included. If you have relevant experience designing similar apps, I’d love to hear from you!