-CreatePickup (When player enters the parking slot) = 'OnPlayerEnterPickup'
-CreateObject (For the gate that opens) = 'OnGameModeInit'
-MoveObject (To open the gate with /payfee command) 'OnPlayerCommandText'
-SetPlayerMoney (For - 2$) 'OnPlayerCommandText'
To create that.
But if you don't want to make that by yourself, post an request here.