From the Unsettled transactions screen, you can take action on transactions that are no longer part of an automated or manual dunning workflow.
Actions can be applied in bulk or per individual transaction, depending on the situation.

Bulk actions allow you to apply the same follow-up to multiple transactions at once.
To perform a bulk action:

Some actions are only available at single transaction level.
To access them:
Mark the selected transaction(s) as paid. Use this when customers have settled their payment through another channel (for example cash or bank transfer).
Resends the selected transactions to the bank or Payment provider for collection.
After this action:
Sends a payment reminder message to the customer.
The reminder options available correspond to the Allow payment alternative settings used in automated dunning workflows.

Depending on your configuration, you can enable one or more of the following:
Use payment link (default)
Send additional SMS
Send registered mail
Grace period
Forwards the selected transactions to the configured collection agency.
The integration used is defined or can be activated via Settings > Integrations > Accounts Receivable.
Sends an official debt collection letter (WIK) to the customer. This action initiates a legally compliant reminder process, typically used as a final step before further legal or collection measures. The letter is sent according to the applicable WIK regulations and serves as formal notification to the customer of the outstanding amount.
Different options are available when sending an official letter (WIK):
Use a payment link
Includes a payment link in the communication, allowing the customer to settle the outstanding amount online. If no PSP is configured, bank transfer details are included instead.
Send additional SMS
Sends an SMS notification to the customer in addition to the official letter, reinforcing the payment request.
SMS messages are queued and sent at a fixed time each day and require SMS to be enabled.
Keep the actual document
Keeps the original invoice or document reference unchanged and includes it as part of the official letter.
Send mail to customer
Sends the official letter directly to the customer via email or postal mail, depending on your configuration and legal requirements.
Grace period
Defines the number of days the customer has to complete the payment after receiving the official letter. Once this period expires, further follow-up actions can be taken.
Admin charges
Allows you to include legally permitted administrative charges in the official letter, in accordance with applicable WIK regulations.
Archives the selected transactions.
Creates a new payment link for the transaction.
Registers a partial payment for the transaction.

Adds an internal comment to track follow-up actions or context.

Use this action when fraudulent behaviour is suspected or confirmed.
Selecting 'Mark as fraud' opens the fraud screen:
You can choose to:

Optionally, enable Find other agreements using the same criteria to apply actions to related agreements:
After selection: