I can't add my guestcard in the webshop

Unfortunately, this function is currently only available in the INSIDE LAAX app.
Shortly download the INSIDE LAAX app. You can log in with the same login as in the webshop. Add the guest card to your profile and benefit from a wide range of discounts and special offers.
Instructions on how to add the guest card to the app can be found here.

The discounts are then automatically deducted from purchases in the app as well as in the webshop.