I honestly regret letting Natwest put this feature in as it's such a hassle whenever I use my debit card online.
I have to type in card details (even though I already do it once on the website I'm using my debit card from, eg Amazon) and my long code, you know with the "enter the 3rd letter; the 5th letter" etc
Thanks if you can help:-)
Read more:
How to get rid of Natwest Secure Safe on my iPad?