My bank provide me with a "e-card" functionality (I can create virtual VISA card with a definite amount of money on it). It is so useful to deal with this new t

My bank provide me with a "e-card" functionality (I can create virtual VISA card with a definite amount of money on it). It is so useful to deal with this new trend of automatically opt-in subscription. If you try to charge me without my consent, the card will just block. Some company even try to send their collection people at me, but I usually remind them that those shady contract where you pay more without any confirmation on your side won't stand in a European court :)