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You cannot use debit for web transactions nor when in a different country.

False and false. Used visa and mc debit cards exclusively for 20 years all over the world and online.

You must be speaking of something different such as "Visa electron" debit cards.

I'm talking about Interac cards, which is what we usually mean when talking about debit cards in Canada:

Most banks have Visa or MC debit cards available now. You can use them online for most things, but at a PoS it defaults back to the Interac network.

Even USA ATMs and POS terminals happily accepted my european Maestro debit card, so that's not really true.