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README.md

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+Here's a structured layout for a complete system, documented in Markdown. This structure covers the essential components, functionality, and setup for a system like a CRM, POS, or ERP application integrated with external services.
+
+---
+
+# Aenzbi System Documentation
+
+## Table of Contents
+- [Overview](#overview)
+- [Features](#features)
+- [System Architecture](#system-architecture)
+- [Modules](#modules)
+  - [User Management](#user-management)
+  - [Product Management](#product-management)
+  - [Inventory Management](#inventory-management)
+  - [Order Management](#order-management)
+  - [Sales Management](#sales-management)
+  - [Invoice Management](#invoice-management)
+  - [Accounting Integration](#accounting-integration)
+  - [EBMS Integration](#ebms-integration)
+- [Technology Stack](#technology-stack)
+- [Setup Instructions](#setup-instructions)
+  - [Prerequisites](#prerequisites)
+  - [Installation](#installation)
+- [Usage](#usage)
+  - [Running the Application](#running-the-application)
+  - [API Endpoints](#api-endpoints)
+- [Deployment](#deployment)
+- [Maintenance](#maintenance)
+- [Security Considerations](#security-considerations)
+- [Troubleshooting](#troubleshooting)
+- [Contributing](#contributing)
+- [License](#license)
+
+---
+
+## Overview
+The Aenzbi System is a comprehensive solution for managing business operations. It integrates a CRM, POS, and ERP with functionalities for inventory, sales, invoicing, and external service integrations. 
+
+**Primary Use Cases:**
+- Retail and restaurant management
+- Digital invoicing and real-time stock updates
+- Integration with EBMS for tax compliance and reporting
+
+## Features
+- **User Management:** Role-based access control and authentication.
+- **Product and Inventory Management:** Track products, stock levels, and reorder points.
+- **Sales and Invoicing:** Real-time invoicing with printable receipts.
+- **External Integrations:** EBMS API integration for tax reporting.
+- **Accounting Module:** Basic accounting functions integrated with sales and purchases.
+
+## System Architecture
+- **Frontend:** Developed in Next.js with responsive design.
+- **Backend:** Node.js API with Express for RESTful endpoints.
+- **Database:** PostgreSQL (for relational data) with Firebase Functions for real-time data.
+- **External API:** EBMS API integration for invoice and stock movement posting.
+
+## Modules
+
+### User Management
+- **Description:** Handles user registration, login, and role-based access control.
+- **Endpoints:**
+  - `POST /auth/register` - Register a new user
+  - `POST /auth/#` - User login
+  - `GET /auth/logout` - Logout current session
+
+### Product Management
+- **Description:** Manage product catalog, descriptions, categories, and #.
+- **Endpoints:**
+  - `POST /products` - Add a new product
+  - `GET /products` - List all products
+  - `PUT /products/:id` - Update product details
+  - `DELETE /products/:id` - Delete a product
+
+### Inventory Management
+- **Description:** Monitor stock levels and manage stock movement.
+- **Endpoints:**
+  - `GET /inventory` - View stock levels
+  - `POST /inventory/add` - Add new stock by purchase or transfer
+  - `POST /inventory/remove` - Reduce stock based on sales or other adjustments
+
+### Order Management
+- **Description:** Create, view, and manage orders and customer details.
+- **Endpoints:**
+  - `POST /orders` - Place a new order
+  - `GET /orders` - View all orders
+  - `PUT /orders/:id` - Update order status or details
+  - `DELETE /orders/:id` - Cancel an order
+
+### Sales Management
+- **Description:** Track and record sales transactions.
+- **Endpoints:**
+  - `POST /sales` - Record a new sale
+  - `GET /sales` - View sales history
+  - `GET /sales/:id` - View specific sale details
+
+### Invoice Management
+- **Description:** Generate invoices, view and print for customers.
+- **Endpoints:**
+  - `POST /invoices` - Generate a new invoice
+  - `GET /invoices` - List all invoices
+  - `GET /invoices/:id` - Retrieve a specific invoice
+  - `POST /invoices/post` - Post invoice data to EBMS
+
+### Accounting Integration
+- **Description:** Track income and expenses, integrate with invoicing and sales.
+- **Endpoints:**
+  - `POST /accounting/entry` - Add new accounting entry
+  - `GET /accounting/ledger` - View ledger entries
+  - `GET /accounting/reports` - Generate reports
+
+### EBMS Integration
+- **Description:** Real-time integration with EBMS for regulatory compliance.
+- **Endpoints:**
+  - `POST /ebms/invoice` - Post invoice data to EBMS
+  - `POST /ebms/stock` - Post stock movement data to EBMS
+
+## Technology Stack
+- **Frontend:** Next.js
+- **Backend:** Node.js, Express
+- **Database:** PostgreSQL, Firebase Functions
+- **Deployment:** Google Cloud Platform, Firebase Hosting
+
+## Setup Instructions
+
+### Prerequisites
+- **Node.js** and **npm** installed
+- **PostgreSQL** database instance
+- **Firebase Account** for Functions and Hosting
+
+### Installation
+1. Clone the repository:
+   ```bash
+   git clone https://github.com/AllyElvis/aenzbi.git
+   cd aenzbi
+   ```
+2. Install dependencies:
+   ```bash
+   npm install
+   ```
+3. Configure environment variables:
+   ```plaintext
+   DATABASE_URL=<Your-Database-URL>
+   EBMS_API_URL=https://ebms.obr.gov.bi:9443/ebms_api
+   EBMS_TOKEN=<Your-EBMS-Token>
+   ```
+
+## Usage
+
+### Running the Application
+1. Start the server:
+   ```bash
+   npm start
+   ```
+2. Access the app at `http://localhost:3000`.
+
+### API Endpoints
+A Postman collection of API endpoints is available in the repository:
+- **Base URL:** `http://localhost:3000/api`
+- **Authentication Required:** For all endpoints, use Bearer token auth.
+
+## Deployment
+
+### Google Cloud (GCP)
+1. Setup Google Cloud project and deploy via Firebase Functions.
+2. Configure Firebase Hosting for the frontend.
+
+### Firebase Functions
+1. Deploy backend functions:
+   ```bash
+   firebase deploy --only functions
+   ```
+
+## Maintenance
+- **Database Backups:** Schedule regular PostgreSQL backups.
+- **Dependency Updates:** Use `npm update` to manage package updates.
+- **Logs and Monitoring:** Enable monitoring for real-time logging and alerts.
+
+## Security Considerations
+- **Access Control:** Ensure sensitive routes are accessible only by authorized roles.
+- **Data Encryption:** Encrypt sensitive data before storing in the database.
+- **Rate Limiting:** Implement rate limiting to prevent abuse of public endpoints.
+
+## Troubleshooting
+- **Database Connection Errors:** Verify `DATABASE_URL` is correctly configured.
+- **API Errors with EBMS:** Check EBMS API URL and token validity.
+- **Deployment Issues:** Review Google Cloud and Firebase logs for error messages.
+
+## Contributing
+To contribute:
+1. Fork the repository.
+2. Create a new branch for your feature.
+3. Submit a pull request with a description of changes.
+
+## License
+This project is licensed under the MIT License.
+
+---