The Couchbase Sync Gateway is a key component of the Couchbase Mobile stack, which facilitates secure data routing and synchronization between web and mobile clients and the Couchbase Server using a REST API. For developers working with the Sync Gateway, Postman offers a practical tool for API testing, development, and documentation, supporting collections for both Admin and Public interfaces. Recent enhancements to the Sync Gateway Postman Collections and Postman itself are discussed, including instructions on importing collections, running mock requests, and testing against a live Sync Gateway instance. The post underscores the utility of features like request chaining, which allows for dynamic updating of environment variables, and the generation of code snippets and documentation via Postman. Developers are encouraged to contribute enhancements or raise issues through the GitHub repository, and the post provides avenues for further engagement and support.