I would say that the plugin is good, but there is a bug where you can't change values using an anvil. I did find that you can change those values in the shop .yml file though. So it does work but if you want to change the price or something you have to go to the.yml, other than that it's a good leak!
i was on nulledbuilds, and i wanted to get a cool build, so i pressed the upgrade, it sent me here, i bought the highest plan, but i dont have it on nulledbuilds