Patent ID: 8620826

Claim:
A system, comprising: a memory; one or more processors coupled to said memory; wherein said memory comprises program instructions executable by the processor to implement a communication interface service configured to: receive a message from a communication device, the message indicating a request to purchase an item; determine that said communication device is not registered with an existing account that includes billing information previously submitted by a user for performing purchases; obtain from the unregistered communication device via a communication channel, identification and authentication information for the existing account that includes the previously-submitted billing information; wherein said existing account is accessible through a network-based interface; wherein said communication channel does not include said network-based interface; and validate the identification and authentication information received from the unregistered communication device through said communication channel as being correct relative to identification and authentication information previously-submitted by said user through the network-based interface, and in response to that validation: complete the purchase of the item with the previously-submitted billing information of the existing account.