eCommerce API Development & Payment Integration

Title: API Development for Shopping Cart & Payment Management

We are looking for an experienced backend developer to build secure and well-documented REST APIs for an eCommerce application.

Project Scope:

* Develop Shopping Cart APIs (Add, Update, Remove, View Cart)
* Manage Product Quantities and Price Calculations
* Save and Retrieve Customer Cart Data
* Develop Checkout APIs
* Integrate a secure payment gateway (Stripe, Razorpay, PayPal, or similar)
* Store and manage payment transactions
* Handle payment success, failure, and refund responses
* Generate order details after successful payment
* Implement JWT authentication and role-based access control
* Write clean, scalable, and well-documented code
* Provide API documentation (Swagger/Postman)

Technical Requirements:

* Node.js with Express (preferred) or Spring Boot
* MongoDB or MySQL
* RESTful API architecture
* Secure authentication and data validation
* Proper error handling and logging

Deliverables:

* Complete source code
* API documentation
* Postman collection
* Database schema
* Deployment assistance (optional)

Please include the following in your proposal:

* Your relevant API development experience
* Similar eCommerce or payment projects you've completed
* Estimated timeline
* Fixed price or hourly rate
* Technologies you recommend for this project

We are looking for a developer who writes clean, maintainable code and communicates effectively throughout the project.