A SEPA Direct Debit Mandate, also known as SDD Mandate, is the authorization through which the debtor allows the creditor to collect payment from his bank account and instructs its bank to pay those collections. As a general rule, the SDD mandate is provided by the creditor and it has to be completed and signed by the debtor in order to come into effect.
The SDD mandate is a prerequisite to collect payment through the SEPA Direct Debit scheme and without it the creditor has no permission to initiate collections.