Has anyone used this system and did it work? Recently I made an online
payment to tmobile through my tmobile account. Part of the way through
the process the Mastercard Securecode window popped up and prompted me
for some details. At first I thought it was a scam or some phishing
thing. Anyway, I continued along and it told me I had failed
authentication, however the payment still went through.
Now o2 are using the same system but my payment didn't get through
when I failed authentication this morning.

Does the Securecode system offer any advantage over the previous
method of online payment. Seems a total pain to me.