On your card you get a pin and check at customer service 😉
I think you are talking About free play! You have to play with your player's club card and earn points and then you get free play..
Usually it's preloaded. Once you insert your card go to account, enter your pin #, go to transfer, enter the amount & you're good to go. Make sure you use the amount you've entered because it won't print out on ticket.
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