You automatically receive a 25% discount on the rental and mileage rate if your ride lasts two days or more (48 hours or more). You do not have to do anything for this, it is valid regardless of your subscription, and you do not need a discount code.
Do you have a Start or Plus subscription? Then you will receive the 25% multiple-day discount, and the fixed discount will not apply.
Do you have a Pro subscription? Then your fixed percentage discount will remain valid.
Curious about the rates? Check the site for the most up-to-date information.