Just like the majority of the apps on the market, Mint also uses a temporary deposit for your credit / debit card when you start riding. If the rental fee was lower than the deposited amount, your bank will render on your account the remaining amount within 2-5 days. If the rental fee is higher than the deposit, the amount will be increased at the end of the journey.
The charged amount from your Credit/Debit card will usually refer to your usage fee. If you ever feel we charged your card unfairly, please let us know and contact our customer support.