PayPal's integration is a redirect to their site for processing. PayPal is complying with 3DS in their own way, see this. As far as I'm aware, PayPal will run 3DS when you register and perhaps periodically after. Since you're redirected to their site to checkout, if they want 3DS later, it'll be on their side. The current integration should hence be 3DS complaint afaik.Does this also affect PayPal, or just Stripe?
Yes, that's what this demonstrates:Also does this support dynamic 3D Secure authentication ?
The last sentence there only applies until, of course, they change their Checkout integration, which they do periodically. We're happy and comfortable with the other tools they provide which gives us more control of things, not least the overall appearance and experience which very much so remains within XenForo but takes care of PCI compliance.
I second this and asked this some time ago as well... Maybe you can develop an addon for this.
Now showing SCA-ready but Upgrade now will open Xenforo Contact Us forum. I think i am already updated to XF 2.1.4, So no upgrade action needed?How would upgrading to a new version of XenForo notify Stripe of that fact?
XF 2.1.4 is, despite what Stripe says, SCA-ready. Stripe have been informed about the work done to add support for it.