Multi-Platform Price Comparison App

I need a complete mobile app that helps shoppers instantly spot the best deal by pulling live prices from Flipkart, Amazon and eBay. I also want the architecture flexible enough to plug in extra Indian marketplaces such as Myntra and Meesho without major refactoring... (Budget: ₹600 - ₹1500 INR, Jobs: Backend Development, Flutter, Mobile App Development, PHP, Python, React Native, REST API, Web Scraping)