Leiby Kandyba With the travel card subscription you will get an IBAN where you can top up your card, you can also do this automatically from another bank account. However the subscription doesn't include a bank account at bunq, so you can't make transfers yourself (and no iDeal etc.). The only way to pay with a Travel Card subscription is to use the Travel Card itself.
Of course if you get a Travel Card inside of a Premium subscription, this limitation doesn't exist ;)