API key for Subdirectories

Hello I need help as I am trying to improve speed of my site by customizing the settings of WordPress Plugin “Litespeed caches plugin” that works smooth with cloudflare.
The matter is that I have various subdirectories on my domain. I use LightSpeed cache plugin with Cloudflare all is going smooth on main domain but when i am customizing the settings of subdirectories in WordPress lightspeed cache plugin i need to add Global API Key / API Token. My question is that can i add the same key that i use for main domain? if No then how to create API key for each subdirectory?