Abstract: A computerized method for generating a time-limited number for use in a payment card transaction involving a payment card issued by a financial institution. The payment card comprises an original payment card number. A first plurality of digits of the original payment card number is provided to a processor. The first plurality of digits are predetermined digits associated to the financial institution. A desired expiration date through which the time-limited number is valid for acceptance in the payment card transaction is provided to the processor. A program is executed by the processor to set a first plurality of digits in the time-limited number to the first plurality of digits in the original payment card number, generate a first number corresponding to the desired expiration date, set a second plurality of digits in the time-limited number to the first number, and output the time-limited number.