| CPC G06Q 20/4097 (2013.01) [G06Q 20/351 (2013.01); G06Q 20/4016 (2013.01); G06Q 20/407 (2013.01)] | 20 Claims |

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1. A user authentication system, comprising:
a processor coupled to a memory that includes instructions that, when executed by the processor, cause the processor to:
request a virtual card number as a login credential for a user to gain access to a third-party website, the virtual card number associated with an issued primary credit card from a financial institution;
receive, from the user, the virtual card number as the login credential for access to the third-party website;
transmit the virtual card number with a zero charge amount through a credit card payment network to the financial institution that issued the primary credit card and the virtual card number for payment authorization; and
authenticate the user to gain access to the third-party website in response to approved payment authorization by the financial institution or return an authentication error in response to a declined payment authorization.
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