I don't know how it happened but npc's/vending machines got deleted in bandit. I was wondering if it was possible to restore them back to default? I don't know if this is the right place or not to ask air wolf vendor and Spawner are there

I suggest you add them back with just the spawn command, rather than using this plugin, so that you don't have duplicate vending machines this wipe.

You will have to determine the prefab names of each one. You can do that with trial and error by just spawning the different ones and checking if they are selling the right things, or you can launch a test server and "ent kill" the same vending machines, since that will log the prefab name in the server console, then go back to the main server and spawn those prefabs in approximately the original locations.