I ordered some items in amazon.com .Payment mode was through mastercard debit and I was not asked for cvv. This is the first time i added the debit card though I initially had my credit card details added to my account. The card is tied to a non US bank account.
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                    3This really isn't a security question but a payment card and payment processing question. I'm not sure where to direct this question. – schroeder Jan 16 '19 at 19:50
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                    I'm sure it varies quite a bit depending on the card and debit system being used, but in Canada, Interac cards don't have a CVV. It may relate to that. – JMac Jan 16 '19 at 19:53