Here’s how to set knockout rewards so that when a player kills a sentry or a player from another team, they will receive cash.
Place a lifecycle wherever. (It doesn’t matter where)
Set the lifecycle to the event: “Player Knocks Out.” Then, for when the event occurs, set the channel to whatever you want. I chose “knock-out.”
Now place an item granter.
Edit it so the item granted is cash. Make sure the channel is the same as the one you chose in step two.