The Capella Management API has been revamped to enhance its RESTful, extensible, robust, and secure nature, offering new features aimed at improving control, security, and usability for DevOps workflows. The API supports a wide range of functionalities, including project and cluster management, user role modifications, database credential integration, and backup scheduling, all authenticated with API Keys. The article provides a detailed walkthrough for setting up and using the API with Postman, emphasizing the need for new API keys due to incompatibility with previous versions. Users are instructed on how to generate API keys, import the OpenAPI specification, set up authorization, and interact with various API endpoints, including creating projects and deploying clusters. The guide aims to facilitate the integration of the API into existing Infrastructure-as-Code tools and deployment scripts, highlighting its potential for automating tasks within organizations.