Hertz rental security deposit

I have a rental I am picking up at airport in Toronto later today. I prepaid the rental online, and still have $92 due when I arrive.

I can pay the 92 on debit but I know there is a security deposit of $200 so I am wondering if anyone knows if the 200 is really just 200 because I only have 240 available on my amex. I’m seeing different answers to this online, so does anyone know for sure?
Also I’m under 25 and not AAA.