REST APIs are extremely useful for accessing and modifying data within XSA Multi-Target Applications. When it comes to checking whether the API you’ve designed is working properly or not, things becomes a little difficult if you are not familiar with web security protocols. In this blog, I am going to briefly describe OAuth 2.0, the security protocol used by XSA for user authentication and authorization (UAA), and cover details on how you can make HTTP requests to different modules within an XSA application.