How to Call a function after player Spawned on a "player_checkpoint_device"

Hi Devlepoers!
I need to call a function in my verse code after players are spawned, but the the problem is I registerd players on “Player Checkpoint Deviceses” , and I don’t see any function on them to call after player spawned .
Is there any way to call a function after a player spawned on a Player Checkpoint Devicese?