How does MasterCard® SecureCodeTM work?
Once you’ve registered and created a SecureCode, each time you make an online purchase, a window will pop up asking for your SecureCode, just like using a Personal Identification Number(PIN) at the ATM. When you corrctly enter your SecureCode, your card issuer confirms that you are the authorized cardholder and your purchase is completed. No code, no confirmation, no purchase.