Imprex | Point of Sale Flask Application

Version: 2.0.0 | Last updated: 2026

Imprex is a complete, ready-to-deploy point-of-sale system built with Flask (Python). Designed for small and medium businesses, it offers a touch-friendly cashier interface, real-time inventory tracking, multi-currency support, and an admin dashboard with sales analytics.

Live Preview Click to access the live demo at the link above.

Table of Contents

1. Requirements
2. Installation
3. Configuration
4. Usage
5. Features
6. Demo Credentials
7. Deployment (Production Server)
8. File Structure
9. Troubleshooting

Requirements

• Python 3.8 or higher
• pip (Python package manager)

Installation

First-time Setup on a New PC (Windows Local)

1. Extract the ZIP file to your desired location.
2. Double-click runnewpc.bat — it will:
   • Check that Python is installed
   • Create a virtual environment (venv)
   • Install all dependencies
   • Create .env from .env.example with a generated SECRET_KEY (first run only)
   • Start the application automatically
3. Open your browser and go to: http://127.0.0.1:5000

Daily Launch (after installation)

1. Double-click start.bat to start the application.

Note: Both runnewpc.bat and start.bat automatically create .env from .env.example with a securely generated SECRET_KEY the first time they run. No manual configuration is required to get started.

Manual Method (macOS/Linux Local or Command Line)

1. Open a terminal in the project folder.
2. Create and activate a virtual environment:

   python -m venv venv # Windows: venv\Scripts\activate # macOS / Linux: source venv/bin/activate

3. Install dependencies:

   pip install -r requirements.txt

4. Copy the environment configuration template:

   # Windows: copy .env.example .env # macOS / Linux: cp .env.example .env

5. Launch the application:

   python run.py

6. Open your browser and go to http://localhost:5000 and log in with admin / admin.

Note: The first launch automatically creates the SQLite database and pre-populates it with demo products, categories, and user accounts (admin / admin and user / user) — no manual database setup required.

Configuration

The application is configured via the .env file. Available settings:

Variable	Description	Default Value
SECRET_KEY	Flask secret key for session encryption. Auto-generated by start.bat / runnewpc.bat on first run.	Auto-generated (change for production)
DATABASE_URL	Database connection string	sqlite:///instance/pos.db
ADMIN_USERNAME	Default admin username	admin
ADMIN_PASSWORD	Default admin password	admin
CASHIER_USERNAME	Default cashier username	user
CASHIER_PASSWORD	Default cashier password	user
SEED_DEMO_USERS	Auto-create demo accounts on first launch (set to false after initial setup in production)	true
STORE_NAME	Store name displayed on receipts and the UI	Imprex POS
STORE_ADDRESS	Store address displayed on receipts	Your Address Here
CURRENCY	Default currency code	MAD

Security: Set the SECRET_KEY and all passwords via environment variables before deploying to production.

Usage

Admin Dashboard

The admin dashboard provides:

• Real-time sales statistics and revenue overview
• Interactive charts for sales trends
• Low stock alerts
• User management (add, edit, delete)
• Complete product and category management (CRUD)
• Transaction history with CSV export
• Receipt reprint

POS (Point of Sale) Interface

The POS interface offers:

• Touch-optimized product grid for tablets and touchscreens
• Category filtering
• Real-time cart management with quantity controls
• Product search and barcode scanning
• Multiple payment methods: Cash, Card, Mobile
• Automatic change calculation
• Receipt printing
• Multi-currency support with live exchange rates

Features

POS Interface

• Touch-optimized layout for tablets and touchscreens
• Real-time cart management with add/remove/quantity controls
• Product search and barcode scanning support
• Cash, bank card, and mobile payment
• Automatic change calculation
• Receipt printing

Inventory & Stock

• Full CRUD (Create, Read, Update, Delete) for products
• Customizable categories with icons
• Stock movement tracking
• Low stock alerts
• Inventory adjustments

Multi-Currency Support

• 10 supported currencies
• Live exchange rates via external API
• Currency selector on the POS screen
• Dynamic amount conversion

⚠️ Warning — Live Exchange Rates: The live exchange rate feature relies on an external service (exchange rate API). This service may require a paid API key and/or incur additional fees depending on the provider used. Default exchange rates are static and must be configured manually in the application if no API key is provided. Please consult the API provider’s documentation for details on limitations and costs.

User Management

• Administrator and Cashier roles
• Cashier linked to receipts for traceability
• Secure authentication with session management

Admin Dashboard

• Real-time sales statistics
• Interactive charts (Chart.js)
• Low stock warnings
• Revenue overview

Sales & Reports

• Complete transaction logs
• Filtering by date, cashier, or payment method
• CSV data export
• Receipt reprint

Demo Credentials

To test the live application online before installing it locally, use the credentials below:

Role	Username	Password	Access
Admin	admin	admin	Full access: dashboard, products, users, reports
Cashier	user	user	POS interface only

Important: Change these default credentials immediately after installation in a production environment.

Deployment (Production Server)

Production Server Installation via cPanel SSH Terminal

Unlike a local installation where .bat files handle setup automatically, a production environment (such as cPanel Shared Hosting) requires explicit steps to isolate the environment and generate seed users over restrictive environments. Follow these commands in order via your cPanel Browser Terminal or direct SSH client (like PuTTY):

1. Navigate to your production folder:

   cd public_html/imprex-pos

2. Create an isolated Python Virtual Environment:

   Shared hosts usually disable ensurepip natively. We safely create the venv without pip and activate it first:

   python3 -m venv venv --without-pip source venv/bin/activate

   Check: You should now see (venv) prepended to your terminal line.

3. Bootstrap Pip manually for your specific Python version (e.g., Python 3.9):

   curl https://bootstrap.pypa.io/pip/3.9/get-pip.py -o get-pip.py python3 get-pip.py rm get-pip.py

4. Install your dependencies cleanly inside the environment:

   pip install -r requirements.txt

5. Initialize your Environment file:

   cp .env.example .env

   Tip: You can now access your .env inside cPanel File Manager to change production settings like your live database URL or store details.

6. Force Database Table Generation and Create Admin User:

   Execute this unified script to securely create your tables (`instance/pos.db`) and seed your default administrative user safely across production factory patterns:

   python3 -c "  from app import create_app, db import sys sys.path.append('.') try:     import models except ImportError:     from app import models  app = create_app() with app.app_context():     db.create_all()     UserModel = None     if hasattr(models, 'User'):         UserModel = models.User     elif hasattr(sys.modules['app'], 'models') and hasattr(sys.modules['app'].models, 'User'):         UserModel = sys.modules['app'].models.User      if UserModel and not UserModel.query.filter_by(username='admin').first():         admin_user = UserModel(username='admin', role='admin')         admin_user.set_password('admin')         db.session.add(admin_user)         db.session.commit()         print('SUCCESS: Database created and admin user seeded!')     else:         print('INFO: Admin already exists or DB ready.') "

7. Recycle and Restart the Production Application Server:

   Shared hosting Passenger WSGI layers cache the server processes. Run this to force cPanel to immediately read your new active database updates and configurations:

   mkdir -p tmp touch tmp/restart.txt

Server Sign In: Once done, go to your live website URL, perform a hard refresh (Ctrl + F5) to clean up old session cache, and log in securely with admin / admin.

Production Recommendations

• Use a production WSGI server like Gunicorn or Waitress instead of Flask’s built-in server.
• Set debug=False in production.
• Use a strong, randomly generated SECRET_KEY.
• Consider using PostgreSQL or MySQL instead of SQLite for high-traffic deployments.
• Enable HTTPS for all production deployments.

File Structure

imprex-pos/     app.py                  # Main Flask application     config.py               # Configuration settings     models.py               # Database models (SQLAlchemy)     run.py                  # Application entry point     hardware.py             # Optional hardware drivers (printer, cash drawer, VFD)     requirements.txt        # Python dependencies     passenger_wsgi.py       # WSGI entry point for cPanel     start.bat               # Windows daily-launch script (auto-creates .env on first run)     runnewpc.bat            # Windows first-install script     .env.example            # Environment configuration template (copy to .env)     documentation/          # Documentation folder         index.html          # This documentation file     instance/               # SQLite database (auto-generated)     static/         css/             pos.css         # Custom CSS styles         js/             app.js          # Common JavaScript utilities             pos.js          # POS interface JavaScript     templates/         base.html           # Base layout template         dashboard.html      # Admin dashboard         history.html        # Transaction history         index.html          # Home page         inventory.html      # Product inventory management         login.html          # Login page         pos.html            # Main POS (cashier) interface         product_form.html   # Add/edit product form         category_form.html  # Add/edit category form         sale_detail.html    # Detailed sale view         scan.html           # Barcode scanning         stock_adjustment.html # Stock adjustment form         users.html          # User management         user_form.html      # Add/edit user form     uploads/                # Uploaded product images

Troubleshooting

Cannot Log In (admin/admin not working)

This usually means a pre-seeded database exists. Delete the instance/pos.db file (or the entire instance/ folder) and restart — the application will re-seed fresh accounts matching your .env credentials.

Database Errors

If you encounter database errors, delete the instance/ folder and restart the application. The database will be recreated automatically with demo data.

Port Already in Use

If port 5000 is already in use, you can change the port by setting PORT=5001 (or any free port) in your .env file.

Dependencies Won’t Install

Make sure you are using the correct Python version (3.8+). Try upgrading pip first:

pip install --upgrade pip

Thermal Printer / Cash Drawer Not Working

Hardware peripherals are optional. If the python-escpos package cannot load (missing USB drivers, unsupported OS, etc.), the application continues to run normally — printer and cash drawer features are simply disabled. Check the server log for a warning message like “python-escpos unavailable”. To enable hardware support, install the USB drivers for your printer and ensure python-escpos>=3.1.0 is installed.

Images Not Displaying

Make sure the uploads/ folder exists and is writable. Product images are stored locally in this folder.