Permissions system

Hello,

I watched recently Nelderson Gaming videos about online serwer plugins for RMMV - which is great solution for me as i always wanted to do some mmo game in movie maker (yes i am aware of danger etc..).

Anyway! I wish to know, if anyone could help me to write some script/plugin which will be an extension for his idea of plugins.
https://github.com/Nelderson/MV_Online

Basically his plugin for log in create data in mongodb, i woud like to be able to use "nickname" from this db to read permissions node.

For example:

ID: Sernik permissions: 1

He also wrote metrics plugin which gathers data and create metrics database, but again, i do not know how to make the data readable back in game...

3rd idea i have is an NPC creating PLAYER_NAME_FILE with his permissions inside - i even found good solution for that:
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The only problem there is - i dont know how to make an NPC to create file with unique_player_name.
(So each character after speaking with him will have his own txt file stored somewhere/in database).

Could anyone help me and write script or some commands which will create file/data in mongodb with Nelderson's_login_playername or with unique 1st party character name? (If you choose 2option, please make it also check if file with this name already exists before creating new one...).