Digital Marketplace App Build

I need a full-featured marketplace devoted exclusively to digital products, delivered as both an Android application and a responsive web app that share a single back-end. Purchasers must be able to browse, pay, download, and then discuss their purchases with sellers directly inside the platform, so friction-free payment integration and a reliable in-app chat are the two core functions that drive this project.

Here’s what I expect to walk away with:
• A polished Android APK plus a matching PWA or web front end that stay visually consistent across devices.
• A secure payment gateway (Stripe is my first choice, though I’m open if you can justify another). It needs to handle multiple currencies and generate receipts automatically.
• Real-time chat embedded in each transaction thread so buyers and sellers can clarify issues, send links or screenshots, and keep a searchable history.
• A shared database and admin dashboard that lets me approve listings, view transactions, and export reports.
• Clean, well-commented code, brief setup documentation, and a hand-off call to make sure I can deploy updates without you.

If you have a proven stack for this kind of cross-platform build and can point me to similar live projects, I’m ready to start right away.