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To add a discount subscription to your card, you should go to the webshop and order the product from there. If you wish to order the Dal Voordeel subscription, then you can go to this page, click the Add to card button and follow the instructions on the screen. Note that you need to have a Dutch bank account with iDEAL to be able to order a subscription online. If you have a European IBAN account, then you can order a subscription by phone (030-7515155).