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In these cases there are several things you can do to solve this:
Extend the order expiration period of your order system, or decrease the iDEAL expiration period. This way you will have a trigger for retreiving the iDEAL status in time and your order system will always be updated with the final iDEAL status. You can do this by providing a value for
expirationPeriod
expiration period in your iDEAL
TransactionRequestTransaction Request (if your Acquirer/CPSP supports this).
Include an extra time trigger of 3
miuntesminutes for collecting the iDEAL status. The vast majority of users will have finished the authentication in their banking screens by then, so almost any iDEAL payment confirmation (with status success) should be collectable by then.