Tell me about authorization between microservices in your project and the communication methods between microservices.

In our project, authentication between microservices is implemented using JWT (JSON Web Token) tokens. Each service, upon authentication, receives a token with the necessary access rights, which is then passed in the HTTP request headers to other services. This allows centralized access control and minimizes the number of requests to the authorization server.

There are two main methods used for communication between microservices:

1. Synchronous HTTP REST API — for requests where a quick response and easy integration are important. In this case, services exchange JSON or Protobuf messages.

2. Asynchronous communication via message queues (e.g., Kafka, RabbitMQ) — for event-driven architecture, where reliable delivery and scalability are crucial. This allows services to be loosely coupled and process messages at their own pace.

This approach provides a balance between performance, reliability, and security in a distributed system.