Hi,
The PayPal Payflow Pro API doesn't support 3DS cards as far as I know. We based ourselves on this documentation from PayPal:
www.paypalobjects.com/webstatic/en_US/de...payflowpro_guide.pdf
And it doesn't talk about this.
I suppose that this is because this API is mainly for USA merchants, and not really EU merchants where 3DS is used a lot.
So you probably want to use another payment plugin, like the standard PayPal payment plugin also preinstalled with HikaShop, and which supports 3DS and credit card payments.