Scalable Backend API for E-Commerce with Authentication, Orders, and Payments

Design and generate a fully functional, scalable backend API for an e-commerce platform using a modern technology stack (e.g., Node.js with Express or similar). The API should follow best practices for clean architecture, modular folder structure, and maintainability.

Include the following core modules and features:

1. User Authentication & Authorization
   • User registration and login
   • Secure password hashing
   • JWT-based authentication
   • Role-based access control (e.g., admin, customer)
2. Management of Products
   • CRUD processes for goods
   • Inventory control and categories
   • Image management (upload/store URLs)
3. Purchasing Cart
   • Add, edit, and remove products from your cart
   • User account-linked persistent cart
4. Management of Orders
   • Make and oversee orders
   • Order status monitoring (pending, shipped, delivered, etc.)
   • Users’ order history
5. Integration of Payments
   • Include a simulated or actual payment gateway, such as Razorpay or Stripe.
   • Manage transaction data and payment status.
6. Error Handling & Middleware
   • Centralized management of errors
   • Verify and sanitize the request
   • Middleware for authentication
7. Integrating Databases
   • Make use of a database (such as PostgreSQL or MongoDB).
   • Describe appropriate linkages and schemas/models.
8. Extra Conditions
   • Principles of RESTful API design
   • Configuration dependent on the environment
   • API documentation (Swagger/OpenAPI, for example)
   • Logging and fundamental security measures (such as CORS and rate limitation)

Make sure that the code has a clear division of responsibilities and reusable parts, is well-structured, commented, and ready for production.