Thanks for the reply. Ironically, we probably have much less interest in 3-D Secure if Radar will now let us deal with the same "sudden spike in dubious sign-u

Thanks for the reply. Ironically, we probably have much less interest in 3-D Secure if Radar will now let us deal with the same "sudden spike in dubious sign-ups" problem anyway. One interesting possibility might be if the kind of rules you allow for Radar could be used to determine whether to apply 3-D Secure if it's available, so we could enable it selectively for countries where people don't already have a zip/postal code to verify for example. However, for my own small businesses, I suspect we'll be more interested in what Radar can do, particularly to add immediate extra security checks if we are suspicious of a pattern of requests from a certain part of the world.