I have a largish payment to make last week and I have been given several methods of doing this but using Cardknox looks the preferred method of payment as it is top of the list and in bold font. I have not come across this method before though I did type in the address linked in the invoice and all looks pretty straightforward, name, address, card details and amount. The funds will be from a Santander account who are notoriously slow to transfer payment so if this is a quicker and safe then should I use it?
Cardknox seems to be a very new service and I can find only minimal feedback online, not enough to form a judgement. I would leave them alone until they establish a reputation, whether that be good or bad.