Paula It's probably an authorization and then another actual charge made separately by the merchant (airline, hotel etc.) -- this can sometimes happen depending on how the merchant has set up their payment system. Really it's nothing to do with bunq, the same thing will happen if you use any other bank's card. But of course, if you use a credit card with a credit line that you only have to pay after you get your monthly statement, by that time the authorization charge is already vanished so it wouldn't affect you then. It would however affect your remaining available credit line even in that case, for roughly the same amount of time that it takes at bunq for that first charge to get reversed. Bottom line is that you'll get your money back of course, but due to how credit card networks are set up, at least momentarily a bigger amount of money may get blocked and is unavailable to you. It's not really any hassle if you have enough money on your account anyway, but I see why it could be irritating or rather unusable in case you only leave the minimum amount necessary on the account. Pretty sure if bunq could do something about this they would, after all it affects customer satisfaction, and even the big networks like Mastercard and Visa would probably like to modernize themselves, but it's not exactly trivially done if you operate in almost all countries worldwide and have to make sure that everything remains compatible so people can still pay internationally.