What is your refund policy?
Your rental amount is due when you receive the bike. Should you have to end your rental early, for whatever reason, then your rental will be recalculated for the revised rental rate and the excess that you paid will be refunded in full. For example, if you rented a bike for two days that rents for $100/day for a one day rental and $90/day, and then you changed your rental to one day, you would receive a refund of $80.
The security deposit that you provide is fully refunded once the bike is returned no with no more than normal wear and tear.