To retrieve the iDEAL payment confirmation, you perform a Status Request when the Consumer returns to your page via the return URL  that you provided in the Transaction Request. However, it is possible for the Consumer to close his banking-page browser before being returned to this return URL (even when he has authenticated the payment). To make sure you still receive the final iDEAL payment status, it is mandatory to also perform a Status Request in case the Consumer does not return to the Merchant's website.