3D secure was created by Visa and Mastercard, to add another layer of security to online purchases, similar to Chip and PIN in stores.
The 3D secure pop-up will show you the personal message you used when you registered for 3D secure, and you will need to input your 3D secure password. The personal message selected at registration will be displayed so that you know that the popup is genuine. This pop-up is controlled by the bank the card is issued by, not by Nespresso.
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