What do the ‘Additional Security Measures’ entail?

As well as moving to a payment page entirely hosted by Adyen, merchants have to implement a change-detection alerting mechanism (File Integrity Monitoring, ‘FIM’). The purpose of the FIM is to check for unauthorized modifications in files responsible for the redirect towards Adyen. Merchants are expected to continuously keep the payment page safe and secure. Additionally, the merchant must maintain and document an internal process to test that the FIM is implemented properly and working effectively. 

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