A Flask-based web application that integrates with QuickBooks API to calculate sales tax for transactions.

• QuickBooks OAuth2 authentication
• Customer and Item selection from QuickBooks
• Sales tax calculation based on shipping addresses
• Real-time tax rate calculation using QuickBooks Tax API

• Python 3.x
• QuickBooks Developer Account
• ngrok (for local development)

1. Clone the repository:

git clone cd SalesTax

2. Create and activate a virtual environment:

python3 -m venv venv source venv/bin/activate # On Windows: venv\Scripts\activate

3. Install dependencies:

pip install -r requirements.txt

4. Create a .env file with your QuickBooks credentials:

CLIENT_ID=your_client_id CLIENT_SECRET=your_client_secret REDIRECT_URI=your_redirect_uri 

1. Update config.py with your QuickBooks API credentials
2. Set up your QuickBooks Developer account and configure the OAuth2 redirect URI
3. For local development, use ngrok to create a public URL:

ngrok http 5000

1. Start the Flask application:

python3 app.py

2. Access the application at http://localhost:5000
3. Click "Connect to QuickBooks" to authenticate
4. Select a customer and item from the dropdowns
5. Enter shipping addresses and transaction details
6. Click "Calculate Tax" to get the tax amount