Register A Listener
How To Register A New Listener?
Simplify create your Listener Class and then put:
Spigot Listener Register
RewardsXAPI.getRserver().getSpigotRserver().registerEvents(new YourListenerClass());
BungeeCord Listener Register
RewardsXAPI.getRserver().getBungeeRserver().registerEvents(new YourListenerClass());
Velocity Listener Register
RewardsXAPI.getRserver().getVelocityRserver().registerEvents(new YourListenerClass());
That's It!