At various online stores you can pay by issuing a one-off direct debit authorization. A One-time authorization is also called a direct debit. The one-off authorization (direct debit) is a payment method in which the seller receives permission from the buyer to collect money from his account. Direct debit mandates are a way to issue an authorization online through your bank. By doing so, you give permission to a company to debit money from your account via a European direct debit. A signature on paper is no longer necessary.