When you add a card to your Plastiq account, we send over a request to your card-issuing bank for either a $0 or a $1 authorization (different banks will permit different amounts).
The purpose of this authorization is to verify that the card is active and that the bank will allow it to be authorized. Regardless of whether or not the authorization is declined, we will reverse our authorization request immediately.
However, even if a bank declines the authorization, you may still see an authorization for $1 or $0 on your credit card statement. This authorization is not a charge and it will disappear from your statement. Depending on your bank's processing speeds, the authorization will be removed from your statement. It can drop within a few minutes or within a few business days.