A Flask-based invoice generator leveraging WeasyPrint, featuring a customizable invoice template. This system dynamically generates invoices using Jinja, simplifying the process of crafting polished and professional invoices.

Make sure you have the following dependencies installed:

• Python (3.11.4)
• Flask (3.0.0)
• WeasyPrint (60.1)

To run the application, execute the following command in the terminal:

python yourapp.py

Please note that running the application on Chrome directly may not be effective. Clients are required to send data in the form of JSON using the header:

if request.headers.get("Content-Type") == "application/json":

This ensures that the server processes the incoming data correctly.

1. Open Postman.
2. Set the request type to POST.
3. Enter the URL: http://localhost:5000/ (or the appropriate URL for your Flask application).
4. In the Headers section, add a new header:
   • Key: Content-Type
   • Value: application/json
5. In the Body section:
   • Select the "raw" option.
   • Choose JSON (application/json) as the type.
   • Enter your JSON data in the request body. For example:

     {
       "duedate": "November 7, 2023",
       "other_key": "other_value",
       "another_key": "another_value",
     
       ...
     }

6. Click the "Send" button to make the POST request.

Ensure that your Flask application is running and listening on http://localhost:5000/. The data structure in the JSON body should match what Flask application expects.

Invoice Numbering:

• Implement an automatic invoice numbering system to assign unique numbers to each generated invoice.

Discounts and Coupons:

• Provide the ability to apply discounts or coupons to invoices, both as a percentage and fixed amount.

Multiple Currency Support:

• Allow users to select and display invoices in different currencies, with automatic currency conversion.

Payment Status Tracking:

• Implement a system to track and display the payment status of each invoice (paid, pending, overdue).

Email Integration:

• Enable users to send invoices directly to clients via email and include an option to attach the PDF invoice.

Due Date and Late Fee: - Allow users to set due dates for invoices and implement automatic late fee calculation for overdue payments.

Integration with Payment Gateways: - Integrate popular payment gateways to facilitate online payments directly from the invoice.

Offline Mode: - Implement a feature that allows users to generate invoices and access basic functionality even when offline, with data synchronization once online.

Attachment Support: - Allow users to attach additional files or documents to the invoice, such as contracts, receipts, or supporting documents.

User Roles and Permissions: - Implement role-based access control to restrict certain functionalities based on user roles (admin, staff, client).

Notification System: - Set up a notification system to alert users about upcoming due dates, overdue payments, or other important events.