01When you pay on the Internet, you fill in your card details. |
02We send you a one-time password in sms. |
03You enter the password on a separate secure page to complete the purchase. |
For reasons of safety the seller's website should support Mastercard SecureCode or Verified by Visa technology.
If it does not support, then you will pay for the purchase without a one-time password. On such sites, under the rules of Visa and Mastercard, the seller will be liable for fraud with your card.