When I am receiving the Mollie payment status for the notification, it’s unknown. The status is receiving any seconds. So it’s not possible to notificate the customer the status.
Is there a workaround for sending the notification a little time afterwards with the correct status.
Or do I need merge_tag="{gf-mollie-payment-status}?
You’ll find there is an event setting on the notification configuration page, so can configure notifications to be sent when the payment status has been confirmed by Mollie. You could configure one notification to sent on the Payment Completed event, and another to be sent on the Payment Failed event.