Most campaigns are automatically applied to your booking, while others need to be activated manually in the app under Account. You can always find the terms in the email dispatch.
Please note that you will not see your campaign or promo code in the estimated amount, and the discount only applies to the booked time. The discount will only be visible when we charge your card. The campaign price will also be shown on your receipt once the payment has been completed.
Which campaign is used for your booking is determined by the expiration date, and unfortunately, you cannot choose which campaign to use first.