When a client performs a refund on his payment, Mollie sends you an email notifying about the refund. Poppyz however cannot detect this transaction so you will have to manually confirm the refund to rollback the payment that has been made. To do this, go to WP Admin: Courses -> Students and click on the Confirm Refund button.
You will also need to update the invoice to unpaid. To know which invoice it is, login to your Mollie account and look for the refunded payment’s description. This is where you’ll see the Invoice ID:
In the Invoices page you can then look for this ID and mark it as unpaid:
Keep it mind that doing this process again will keep on reverting the previous payments so make sure to only do it on the right subscription. If you do it by mistake you can click on Subscribe but this makes the subscription fully paid – so you’ll have to click on the Confirm Refund button again until it’s on the right payment.