You said it's plugins, but why use plugins for things like cheat codes? You can actually simple event that.
plugin for RPG Maker MZ which will allow you to get a large number of coins through the code 4111 · By
This plugin makes it possible to create something like promotional codes. And they can be entered at any time simply by writing what you need on the keyboard. This is not an event so you don't configure anything. You just run it in the plugin manager. The most important thing is that you can use the plugin to easily check the game. Overall this is just a nice addition for players. And yes I will make the plugin free