insane: I gave up trying to use my ASB debit card online for the same reason, doesn't work on anything, not even Vodafone.
And yes I did make sure the billing address the card is registered to is correct :)
Billing address is irrelevant. New Zealand cards don't support AVS - the only detail which can be validated is the country (and even then I suspect merchants only do that with a blind BIN check).
dickytim: never had a problem online with my Visa Debit from ASB.
One thing I do note is that when I am in store and accidently press credit while using my Visa Debit card it will reject the transaction, all I have to do it select the correct account and try again.
So what you're saying is that you DO have a problem then, because the whole point of this thread is that for some reason debit cards are constantly being rejected when used as a credit transaction.