I need a complete pharmacy system that combines fast, accurate billing with a robust inventory back-end. The core of the project is a billing module that can issue invoices automatically and feed data straight into a live stock ledger, so every sale adjusts inventory in real time. Inventory control must include: • Real-time stock updates the moment items are sold, returned, or received • Low-stock alerts triggered at thresholds I can set per SKU • Batch and expiry-date tracking so I always know what lots are nearing expiry and can pull reports by batch number The platform also has to talk to my existing tech stack. It should exchange data smoothly with: • Our Point of Sale system for front-counter transactions • The ERP system that handles purchasing and accounting • The CRM we use for customer profiles and loyalty programs Please design the data flow so information stays consistent across all three systems, whether through direct API calls, middleware, or another secure approach you recommend. Deliverables 1. Source code with clear documentation 2. Database schema and migration scripts 3. Tested integrations for POS, ERP, and CRM (demo credentials are available) 4. User guide covering billing, stock set-up, and reporting 5. Deployment instructions and a brief hand-over session Acceptance criteria: every sale must decrement stock instantly, expiry reports must list products within a selectable date range, and two-way sync with POS, ERP, and CRM must run without manual intervention. If you have experience building similar healthcare or retail solutions, let me know; I’m aiming for a clean, intuitive interface and reliable performance.