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There is a proposition in Canada for their local online DD payment platform (Interac) since 2005. The solution is branded "Interac Online" (ref.: www.interac.ca). The cost for the merchant varies between something like 0.35$ to maybe 1$ per transaction.

This can only be used by Canadian banks debit cardholders, and merchants that have an account in a Canadian bank.

There adoption seems to be slow, but the volumes more than double each year. While most of the merchants are interested by this method of payment, the governments shows more interests.

But interoperability of DD is the challenge to go international. Maybe interconnections with existing international solutions could help to resolve the problem, like Paypal, Google, etc.

It shows how far we are of NFC mPayment.

An experience we made at a merchant store that accepts contactless payment shows that they think that mPayment method is another type of card that they do not accept. The clerk was looking suspicious when we used this method of payment, no matter if the transaction was accepted.

Education is basic for those who are the main actors of payment acceptance. But who are responsible to educate? The POS suppliers? The Processors? The Acquirers? The Issuers? The payment networks? The equipement manufacturers? Today, the word of mouth and trial and error methods are the only officiel training they get.

In security, there are many processes based on random sampling, but 100% accuracy is really an "heaven-sent" result.

It also reminds me the way the Mexican Custom has chosen to proceed for in-depth search:

   - At the time to pass the gate to leave the "no man's land" area of the airport, each tourist push a button that lights up either a green or a red light. In case of a red light, the tourists luggages are automatically opened for a detailed review.

There accuracy is very low, but in that case, they count on the fear of the uncontrolled random law.

I would like to see them hire Paul the Octopus and look at the results, but I can predict a long lineup at Mexican custom...