I have a newb question and I'm sorry if this isn't the right place to ask it. I haven't been able to find a tutorial for how the rental system works, but I want to use it.

My question is that I'm not sure of the escrow function. It sounds like it is a deposit on the card should a player choose to take it? Is that something that can happen? Or am I understanding the escrow function wrong? I'm just not sure if I should be asking for the replacement value of the card, or a fraction of it, or none of it, or what.

ELI5?