Convert Static App to React Native

I have an existing static app that I would like to convert into a fully functional React Native mobile application. The app currently doesn't support user authentication, push notifications, and in-app purchases, which I want to add in the React Native version.

Key requirements:
- Convert existing static app to React Native.
- Implement user authentication to allow user registration and login.
- Integrate push notifications for important updates and notifications.
- Enable in-app purchases for users to make transactions within the app.
-Need to use squareup POS API on screens we have already created mobile static app will share each screen apis
its ecommerce app you don't need to create admin and API's as we need to use POS API's only
--you also need to help to install .apk and .ipa on play store and app store

The ideal freelancer for this project should have:
- Extensive experience with React Native and mobile app development.
- Proficiency in implementing user authentication, push notifications, and in-app purchases.
- A strong understanding of integrating third-party services and APIs.
- Good communication skills and a proactive attitude towards problem-solving.

Please share your previous work in React Native or similar projects. Your portfolio will greatly assist me in making an informed decision.