Methods and systems for secure online payment

A method of completing a payment transaction, the method comprising:

• receiving, at an online merchant domain, a payment instruction from a computer associated with a card holder;
• redirecting, by the online merchant domain, the computer to a second web domain;
• receiving, at the second web domain, data from the card holder;
• using, by the second web domain, the received data to authenticate the identity of the card holder;
• upon the second web domain successfully authenticating the identity of the card holder, extracting, from a database of the second web domain, payment card data describing a payment card associated with the card holder;
• transmitting, by the second web domain, the payment card data to the online merchant domain;
• generating and transmitting to the online merchant domain, by the second web domain, an authentication indicator message indicating that the authorization was successful and containing data indicating that the payment card is registered in a digital wallet;
• and
• upon receiving the payment card data and the authentication indicator message, transmitting, by the online merchant domain, the payment card data and the authentication indicator message to an acquiring bank to initiate a money transfer.

A server system supporting a single web domain, for authenticating a card holder to enable a payment to an online merchant domain, the server system comprising:

• a processor;
• and
• a data storage device storing program code which, upon implementation by the processor causes the processor to:
• (i) display a web interface on a screen of a computer of the card holder;
• (ii) receive data from the computer of the card holder via the web interface;
• (iii) use the received data to authenticate the identity of the card holder;
• (iv) upon successfully authenticating the identity of the card holder, extract, from a database of the server system, payment card data describing a payment card associated with the card holder;
• (v) transmit the payment card data to the online merchant domain;
• and
• (vi) generate and transmit to the online merchant domain, an authentication indicator message indicating that the authorization was successful and containing data indicating that the payment card is registered in the wallet.