Abstract: A computer-based funds transfer service provides functionality for users to send and receive payments via a web-based user interface. In one embodiment, the web-based user interface provides functionality for a first user of the service to generate and submit a payment request for sending money to, or collecting money from, a second user, who may but need not be registered with the service. The first user may specify the second user by supplying an email address of the second user, which may be used by the service to notify the second user of the payment request. The email message sent to the second user may include a URL that can be accessed by the second user to register with the service (if not already registered) and complete the transaction.