When you book your first trip with Car Next Door, $150 is charged to your card as a deposit. This will be charged at the time you book your trip and used towards your final trip cost. Any funds left after your trip is billed will be refunded to your Car Next Door account. You can log in to refund it back to your card.
At the end of your trip, your distance charge will be deducted from the deposit.
If you cancel your trip, the cancellation charges (if any) will be deducted from your deposit.
If there's any money remaining, it will be refunded to your Car Next Door account. You can leave it there to use towards future trips, or if you want the cash back now, log in and transfer it back to your card.