Shopify Books Store Mobile App

My online bookstore (https://books.ataka.co.in) already runs smoothly on Shopify; now it’s time to give readers the same experience in a dedicated Android and iOS application. Every core storefront function—browsing, advanced search, cart, checkout, order tracking, reviews, wish-listing—needs to feel native and fluid inside the app.

Key technical requirement
Google Sign-In and Razorpay must be fully contained within the application. No external-browser hand-offs: the OAuth flow and the complete Razorpay payment sheet should open, authenticate, and return in-app so we pass Google Play and App Store review without friction.

Additional functionality
• Push notifications for order status and marketing campaigns
• A user profile area where customers can manage addresses, view past orders, and edit preferences

I’m open to Flutter, React Native, Kotlin/Swift, or any stack you can justify as reliable for a Shopify integration, provided future maintenance is straightforward and performance remains snappy even on low-end devices.

When you reply, outline:
1. The framework you plan to use and how it will hook into Shopify’s Storefront or Admin APIs
2. Your strategy for embedding Google OAuth and Razorpay natively
3. Milestones from first build to final store submission
4. Two or three live apps—ideally Shopify based—that demonstrate similar work

Final hand-off should include source code, build instructions, and written steps for submitting future updates. If you can cover ongoing support, note that as well.