Point of Sale for NMS Pharmacy

This is a standalone Electronic Point of Sale. It uses WPF as its framework and Firebase Realtime Database as its backend. It's part of a freelance project that me and my group are working on. It also includes:

1. An E-Commerce website. (check: nmspharmacy.com)
2. Hybrid mobile apps
3. Rider tracking android app

Note that all connections are through Firebase and no SQL database has been setup locally.

Any suggestion and feedback is highly appreciated.

Login Screen:

Home Screen:

Inventory:

Invoices:

New Invoice:

Purchasing:

Manage Users of POS:

Reporting: