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This project is a payment gateway system built using NestJS, TypeScript, Express, gRPC, Redis, PostgreSQL, and GraphQL. It provides a modular and scalable architecture to handle user authentication, authorization, fraud detection, currency conversion, payment methods, and communication via Kafka.

1. NestJS: A progressive Node.js framework for building scalable and maintainable server-side applications.

2. TypeScript: A superset of JavaScript that adds static types to the language, enhancing code readability and maintainability.

3. Express: A fast, unopinionated, minimalist web framework for Node.js, used as the underlying web server in NestJS.

4. gRPC: A high-performance RPC (Remote Procedure Call) framework that enables efficient communication between microservices.

5. Redis: An in-memory data structure store used as a caching layer for quick data retrieval.

6. PostgreSQL: A powerful open-source relational database management system, chosen for persisting user and payment data.

7. GraphQL: A query language and runtime for APIs, providing a flexible and efficient alternative to traditional REST APIs.

8. Docker: A platform for developing, shipping, and running applications in containers, ensuring consistent deployment across different environments.

9. Kafka: A distributed event streaming platform used for asynchronous communication between different parts of the application.

10. RabbitMQ: A message broker that enables communication between microservices and supports different messaging patterns.

11. Passport: A middleware for handling user authentication strategies in Node.js applications.

12. Bcrypt: A library for hashing and salting passwords, enhancing security for user authentication.

13. JWT (JSON Web Tokens): A compact, URL-safe means of representing claims to be transferred between two parties, commonly used for authentication.

• /src: Main source code directory.

  • /auth: User authentication and authorization module.
  • /fraud: Fraud detection module.
  • /currency: Currency conversion module.
  • /payment-method: Payment method module.
  • /user: User-related functionality (entity, service, controller).
  • /payment: Payment processing functionality (entity, service, controller).
  • /kafka: Kafka service for event-driven communication.
  • /oauth: OAuth module for external authentication.
  • /common: Shared configurations and utilities.

• /graphql: GraphQL-related files and modules.

• /grpc: gRPC-related files and modules.

• /docker: Docker configuration files.

1. Clone the repository:

   git clone https://github.com/your-username/nestjs-payment-gateway.git

2. Install dependencies:

   cd nestjs-payment-gatewaynpm install

3. Set up environment variables:

   Create a.env file with necessary configuration details (e.g., database connection, Kafka/RabbitMQ details, OAuth credentials).

4. Start the application:

   npm run start

1. Fork the repository.
2. Create a new branch for your feature or bug fix.
3. Make changes and submit a pull request.
4. Ensure proper documentation and code quality.

This project is licensed under the MIT License - see theLICENSE.md file for details.

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