Webhooks
Cashier Mollie has already wired up the default Mollie webhook handling for you.
A failed recurring charge will result in the subscription being cancelled directly.
Additionally, listen for the following events (in the Laravel\Cashier\Events namespace) to add app specific behaviour:
OrderPaymentPaidandOrderPaymentFailedFirstPaymentPaidandFirstPaymentFailed
See the Events page for the complete list of available events.