How do you obtain UID of a user?

To obtain the UID (User ID) of a user, you typically need to access the user management system or database where user information is stored. In many programming environments, you can retrieve the UID through user authentication methods or APIs, such as Firebase Authentication, which provides the UID upon successful sign-in. Additionally, if you're working with a specific platform or service, consult its documentation for the appropriate methods to access user details, including the UID.