Shopify E-Commerce Mobile App Development

I need a mobile app that connects directly to a Shopify e-commerce store. The goal is to give shoppers the same smooth experience they already have on the web—browsing products, adding items to the cart, completing secure checkout, and tracking their orders—only now in a native mobile environment.

Key points I want covered:
• Full Shopify API integration for real-time product, inventory, and order data
• Clean, brand-consistent UI with intuitive navigation
• Secure payment processing that mirrors my current Shopify checkout flow
• Push notifications for order updates and promotions
• Deployment to both iOS and Android stores

Please share a brief plan of how you would approach the build, which frameworks or SDKs you prefer, estimated timeline, and links to any Shopify-connected apps you have already launched.