You can bill the customer either automatically or manually for handling fees charged by banks for returned direct debit payments.
If you want to automatically charge the handling fees for all customers, go to "Settings > Payment > Billing" and activate the option "Bill handling fees automatically".
If you want to settle the processing fees manually, go to "Activities > Handling Fees". There you will find all the handling fees that have already been settled, as well as fees to be billed and outstanding.
Click on the drop-down menu for the handling fee you require and select "Bill" or "Don't bill". In the case of "Bill", the status changes from "Open" to "To be billed" and is automatically included in the next billing of the customer and then appears in the list as "Billed".