I understand Google and Microsoft getting into it as it makes sense as a “better” Google search but for StackOverflow that sounds like they have just given up on their current platform.
I tried postman and came to the same conclusion as you. I couldn’t figure it out at all. I downloaded an app for android called “ApI Tester”. I might try out ThunderClient, which others have suggested, if it works on Linux.
How many rooms is that and how much percentage of the average wage would that be?