Windows Takeaway POS System

I need a complete takeaway POS that installs and runs smoothly on any current Windows machine. The core workflow must cover the full service loop—order processing at the counter or over the phone, real-time inventory management that updates with every ticket, and seamless payment integration for cards, cash, and modern wallets. Beyond this, the build has to support reliable third party interogation so I can plug in external services without rewriting code later.

Third-party links are essential from day one:
• Delivery services (think aggregators and in-house drivers)
• Accounting software for end-of-day exports and live P&L snapshots
• Customer loyalty programs so points and promos apply automatically
• Route optimisation that pulls current orders, groups them logically, and sends the most efficient run to drivers

What I expect as deliverables:
1. A Windows installer or portable build with a clear setup guide
2. Source code with comments and a brief architecture overview
3. Configuration panel or API endpoints that let me switch integrations on or off without redeploying
4. A short video or live demo session proving the order-to-delivery cycle works, including one example of each third-party connection

I’m comfortable with the tech stack you choose—just keep it well-documented and future-proof. Let me know your approach to database design, UI framework, and how you’ll keep the system fast under peak loads.