To develop REST APIs, the NextGen Platform relies on Spring Framework specification, on the OpenAPI specification and on the Spring Framework implementation. Moreover, it introduces the Swagger Console, which is a frontend that presents the OpenAPI documentation. OverIT currently uses OpenAPI version 3.0.1 and the documentation of all our APIs is based on the specifications provided by OpenAPI. Furthermore, for OverIT Machine Learning services, a Pythonic OpenAPI implementation is currently used: FastAPI which is version 3.1.0 compliant.