Reminder
With a reminder the creditor requests the debtor to satisfy an obligation after it has become overdue. Legally, it presents a unilateral request requiring communication that can be drawn up without specific form. However, it must be firm and unambiguous and has to express clearly that the payment of the owed debt is requested. It is recommended to send the reminder in writing and by registered mail since the creditor has to proof the receipt of the reminder if necessary.