When storing your credit card details or using Checkout to collect payment
data, our bank sends a request to the issuing bank for either a €0 or a €1
authorization to verify that the card is valid and the bank will allow
it to be authorized.
Regardless of whether or not the authorization is declined, the bank will reverse the authorization request immediately, but it may take 7-10 business days for the pending authorization to disappear from your bank statement.