Temporary holds are a method of verifying credit cards by essentially charging a card and immediately refunding it. So, if you place a $50 temporary hold on new credit cards added, there will be a $50 charge immediately placed on the card, and the card will not be added if this fails. The money is then refunded to the customer.
Temporary holds help to verify that credit cards can be billed for large amounts. We recommend setting your hold amount to the average cost of a ride. This ensures that the customer will most likely have enough money in their account to pay off the total at the end of the ride.