Web service that follows the principles of REST (Representational State Transfer) architecture.

The singleton pattern ensures that a class has only one instance and provides a global access point to it.

The hexagonal architecture, also known as the ports and adapters architecture, separates the business logic of an application from the infrastructure concerns, allowing the application to be tested and deployed in different environments.

The decorator pattern dynamically adds behavior to an object by wrapping it in a decorator object.

The factory pattern defines an interface for creating objects in a super class, but allows subclasses to alter the objects that will be created.

The builder pattern separates the construction of a complex object from its representation, allowing the same construction process to create different representations.