Elise Hey Elise, I have used a UK online Bank's card which provides this feature on their Debit cards, sometimes successful, but never could rent a car. Also, without a number embossed on the card, most merchants refuse the card at sight(from UK and US travel experience). Secondly, if we use the card number for online purpose, would it register as BUNQ Credit card? I have tried the other cards online and Merchants such as 'Hertz' and 'Sixt', have a check on their website which automatically rejects any Debit card masquerading as Credit card.