I want to create a automatic group ranker for example when someone buys a gamepass the person gets ranked, what is the best way to accomplish this nowadays?
Your best bet of making this would probably be using Noblox.
Just host a server on one of your computers.
Are there any already made repositories using that?
Just look it up, I had to do something similar before
https://devforum.roblox.com/t/how-could-i-make-a-game-similar-to-fe2cm/3055102