The text provides a detailed tutorial on deploying an API to both staging and production environments using a continuous integration and continuous delivery (CI/CD) workflow enhanced by approval steps in CircleCI. The process begins with setting up necessary tools and environments, including Node.js, Postman, Heroku, CircleCI, and GitHub. The tutorial guides the reader through creating a Node.js API, cloning its project repository, and defining deployment environments on Heroku. It explains how to automate API testing using Postman Collections and the Newman CLI tool to verify the API's functionality in the staging environment. If the tests succeed, a team member must approve the deployment to the production environment via the CircleCI console. The tutorial concludes by outlining the creation of a deployment pipeline script, including details on configuring jobs for staging, testing, and deployment, and highlights the importance of approval-based workflows in enhancing automated CI processes.