public CompletableFuture<User> lookupUser(UUID uuid) {
        User user = this.plugin.getUserManager().getIfLoaded(uuid);
        if (user != null) {
            return CompletableFuture.completedFuture(user);
        }
        return this.plugin.getStorage().loadUser(uuid, null);
    }
Listener to route permission checks made via fabric-permissions-api to LuckPerms.
fabric/src/main/java/me/lucko/luckperms/fabric/listeners/FabricPermissionsApiListener.java