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This plugin is an API I developed for mods in PaperMC, as I haven’t come across any alternative plugins that allow coding.
Using the API is rather simple, it's kind of like making a Mod.
Though it's not, just lots and lots of abstraction making it easier ^^
For applied examples, look into Example Mod Plugin
I recommend using Dynamic RP, as it's simple to use and specifically designed by me for this purpose.
To view your added items, type /modapi items in the chat. This will display all available ItemGroups. Click on your ItemGroup and see the items you’ve added to it.
You can also use /give

A Modding API for Paper designed to make adding Custom Functionality easy