You can setup Reminder Terms and define the text that you want on reminders. Then you assign a reminder term to the customer and use the system to prepare, print or email reminder document. Part of the reminder terms is the ability to add a fee or interest when issuing the reminder. When dollars are applied to a reminder, the customer ledger entry will get the Reminders document type.
You can also have Finance Charge setups for interest and fees which only do interest charges with a finance charge memo, These customer ledger entries have a document type of Finance Charge
