A method includes electronically receiving at a user device of a second party a digital promise to pay a certain amount of money in exchange for goods or services from the second party, the digital promise to pay being generated by a user device of a first party; electronically sending a request from the user device of the second party to a user device of a third party to electronically transfer the digital promise to pay to the user device of the third party in exchange for goods or services from the third party. Sending the request includes sending at least one set of preferences defined at least by the first party. The method further includes electronically receiving at the user device of the second party from the third party one of an acceptance or a rejection of the request to transfer the digital promise to pay.