As an extra-precautionary step, some e-commerce merchants require you to authorise some payments. This process is called 3D Secure. 3D Secure (3DS) is an additional authorisation for online card payments that helps fight against fraud. If you’re using either your physical or virtual Revolut Business card on a website that requires you to authorise that payment, you can do so by logging in to your Revolut Business mobile app and tapping the ‘Confirm’ button in the notification that you should have received.
Revolut has no control over which merchants require you to go through the 3D Secure process.