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I booked a reservation with Days Inn Singapore using my debit card. It didn't as for the MasterCard secure code, nor I see the money deducted from my account. I would like to know what happens with this reservation, since I see the booking is valid at the site. Can the hotel charge me without my 4-digit pin or the Mastercard secure code?

  • Did you check on the site you booked, some hotels will only charge your card when you use the room or fail to show up. – Willeke May 28 '17 at 18:54
  • You may also want to double-check with the booking site, the hotel, or both, to ensure that your debit card will hold the reservation for you, unless it can also be run as a credit card. And, yes, some merchant systems can run a card without the security code. – Giorgio May 28 '17 at 19:09
  • @Dorothy I suspect you are mixing up CCV2 (three digits on the back) with SecureCode. Please see my answer. – chx May 28 '17 at 23:43
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MasterCard SecureCode is a brand name for "3-D Secure" (also marketed as Verified By Visa) and these days it doesn't even ask a password any more which is not surprising because it's one of the worst form of security ever created, here's a paper titled Verified by Visa and MasterCard SecureCode: Or, How Not to Design Authentication.

Anyways it's not a requirement for a merchant to use it. In fact, only the card number is a requirement, everything else (even CCV2, the three digits on the back) just decreases the rate for the merchant because there's less fraud. See the answers to this question on Security SE.

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