I need a complete, ready-to-use billing application for my retail store. The program must let me ring up sales quickly, keep live inventory counts, and maintain basic customer profiles so I can see who bought what and when. Every transaction should finish with a clean paper receipt that prints instantly from a standard thermal printer—no email option is required right now. Core functions I expect: • Inventory management that updates stock levels automatically as items are sold and warns me when quantities are low. • Real-time sales tracking with daily and monthly reports I can export to Excel or PDF. • A simple customer database tied to each sale for loyalty or return purposes. The interface has to be straightforward enough for cashiers with minimal training, and the system should install on a Windows desktop without complicated server setups. Source code or clear documentation for future tweaks would be appreciated, but the primary deliverable is a stable executable I can deploy at the checkout counter. If you have experience building POS or retail billing solutions, I’d like to see a brief demo or screenshots of similar work before we get started.