RUSH rewards are gifted to users who have connected certain game accounts to the Player Rush site. These rewards are given for a few different actions those players perform in those games.
To gain RUSH rewards by playing Warzone you must first connect your account to the Player Rush site. To see how to do that please check out our article on Connecting Warzone to Player Rush.
Once you have connected your account you can visit your Player Rush Warzone Dashboard.
There you will see your stats and Rewards for Warzone, as well as the Player Rush Warzone Leaderboard. Player Rush members gain RUSH rewards for killing opponents inside of Warzone games, including Battle Royale style and Plunder. The amounts differ between Battle Royale and Plunder, but you gain RUSH Rewards every kill you make playing Warzone.