Best plugin for cross-server permissions

Hello Spigot Community, this is my first post.

Anyways I am looking for a plugin that can do cross-server/bungeecord permissions and have exclusive permissions for each server. The problem is that my Hub server has reduced permissions (no /pay etc.) while my Factions server needs those commands but currently my MySQL + Pex setup doesn't allow for that. I am looking for a workaround like server exclusive permissions