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Typically, the person resource will be used when the customer is onboarded before or as part of the onboarding prosess, often combined with acquiring legitimation with BankID. But the person resource can also be used in an ad hoc fashion, when there is reason for suspicion, or when there is reason to believe that the information has changed. If you have retrieved the SSN and name of the customer, you can at any time check the customer again.