When you pay at the pump with your card, an authorization is performed on your account beforehand. Specifically, the institution that issued your card (not Q8) temporarily blocks an amount between 125 and 375 euros. It does this because it is not known in advance how much you will be filling up for. This amount represents - more or less - the maximum amount that can be spent on a full refueling.
When you have finished refueling, the unused balance is normally released immediately. Sometimes, however, it happens that your bank blocks the balance for longer, sometimes up to a maximum of 30 days.
The blocking, however, does not mean that the amount will be debited from your account, but only serves as a payment guarantee.
If you wish the balance to be released more quickly, we recommend that you contact your bank.