Patent ID: 8660966

Claim:
A method of transferring a payment between a first user of a communication system and a second user of the communication system, comprising: displaying a contact list comprising said second user in a user interface of a client executed at a user terminal of the first user, said client being a computer program downloaded and executed on said user terminal of the first user; said client retrieving and displaying at least one page from a payment provider responsive to said first user selecting a payment transfer option in the user interface; said client automatically identifying the second user as a recipient of said payment in said at least one page retrieved from the payment provider responsive to said first user selecting the second user from the contact list, and receiving information related to said payment entered into said at least one page by said first user; and said client transmitting said information related to said payment to said payment provider to cause said payment provider to transmit a message to a user terminal of the second user over the communication system and transfer said payment from an account of the first user to an account of the second user by linking together authorisation information of the second user in the communication system with authorisation information of the second user in the payment provider using an entity that is trusted by both the communication system and the payment provider.