System and method for securing and authenticating purchase transactions

A validation system for secure authentication of a dual number payment card and for a purchase order approval, comprising:

• a first network interface, for receiving, from a cardholder, via a first path, a request to approve a purchase order, wherein the request includes a site address of a website, an order number and a second card number of a dual number payment card;
• a second network interface, for receiving, from the website, via a second path, a first card number of the dual number payment card, associated with the order number;
• a card details storage for storing multiple pairs of numbers, corresponding to multiple dual number payment cards;
• a central processor, coupled to the first network interface, to the second network interface and to the card details storage, wherein the central processor is configured to utilize the card details storage, for determining an existence of a matching pair of numbers, that identifies a stored dual number payment card, wherein a first number of the matching pair matches the first card number and a second number of the matching pair matches the second card number.

A method for providing a dual number payment card to a user, the method comprising the steps of:

• providing a first card number that is different from any other of multiple first numbers that are stored in a card details storage;
• providing a second card number;
• and
• storing the first card number and the second card number, in association with the dual number payment card, in the card details storage;
• wherein the first card number is intended for transmission, via a first path, from the user to a merchant, during a payment stage of a transaction;
• and the second card number is intended for transmission, via a second path, from the user to a validation center, for requesting a purchase approval.