DebiChecks are debit orders where you confirm before the first monthly payment collection and then confirm again if there are serious changes to the collection (e.g. change in amount or payment date).
You will not be able to reverse DebiChecks that match the information on the register at your bank once payment is made, but you can resolve any disputes with the service or credit provider.
Other debit orders do not have to be confirmed by you before monthly payment collection. Your bank will process the debit orders when the service provider collects, assuming that the service provider who is collecting has a valid mandate in place. These debit orders can be reversed immediately if disputed within 40 days.