You can use your official Postman credentials or create an account in practically no time using an existing Google account as a starting point.
This said, getting started with Postman requires you to undergo a hassle-free installation process, followed by a quick log-in procedure. Originally available only as a Google Chrome extension, you should know that this utility can now be deployed and run just as efficiently on all major OSes out there, thanks to its smooth-running and easy to install Windows, macOS, and Linux clients. Postman is a comprehensive, cross-platform application that provides developers with a set of powerful yet fairly accessible tools for sharing, testing, documenting and monitoring APIs, basically covering the full spectrum of API development.