The API Gateway pattern implements a service that’s the entry point into a microservices-based application from external API clients or consumers. It is responsible for request routing, API composition, and other edge functions, such as authentication.
When working with a microservices architecture, either on a greenfield project or during migration from a monolith, a best practice is to start addressing cross-cutting concerns. Authentication is such a concern, and in this article, we’ll cover the authentication of a multi-tenancy application.