, thanks for getting in touch. As a result of Strong Customer Authentication, you may be asked to verify your identity more frequently when making a purchase online. This has created some challenges for retailers who are not ready to support the request for identity verification which will result in declined transactions. We suggest you contact the retailer and discuss how they might be able to support you to complete your purchase in these instances.
In general, if you have the latest version of the mobile app installed on your device then we would send a push notification there to allow you in authenticate the purchase. If you don't have the mobile app, then we'll send a one-time passcode to your registered mobile phone by SMS. You can find come more information about this below.