A method of identifying one of a plurality of payees using respective payee devices, each payee device being in communication with a respective one of a plurality of identifier transmitters, said method comprising: transmitting, from one of the plurality of payee devices to the identifier transmitter in communication with the payee device, a broadcast identifier provided by a payment processor; transmitting, by the identifier transmitter, a broadcast over a first communication channel, the broadcast comprising the broadcast identifier and a first identifier corresponding to the payee device; monitoring, by a mobile device used by a payor, a first communication channel for receipt from the identifier transmitter of the broadcast comprising the broadcast identifier and the first identifier corresponding to the payee device; upon receipt of the broadcast by the mobile device, determining that the broadcast identifier corresponds to a designated broadcast identifier, and in response to receipt by the mobile device of a first user input, generating an identifier notification comprising the first identifier and a second identifier corresponding to the mobile device, and transmitting the identifier notification over a second communication channel to the payment processor; in response to receipt of the identifier notification at the payment processor, associating the second identifier of the identifier notification with the first identifier of the identifier notification in a memory of the payment processor; upon receipt by a querying device of a second user input to transmit an identifier request comprising the second identifier, the payment processor receiving from the querying device the identifier request comprising the second identifier; and in response to receipt of the identifier request, retrieving the first identifier associated with the second identifier in the memory of the payment processor based on the second identifier of the identifier request, generating a transmitter notification in respect of the identifier request, and transmitting the transmitter notification to the querying device, wherein the querying device is not the mobile device. transmitting, from one of the plurality of payee devices to the identifier transmitter in communication with the payee device, a broadcast identifier provided by a payment processor; transmitting, by the identifier transmitter, a broadcast over a first communication channel, the broadcast comprising the broadcast identifier and a first identifier corresponding to the payee device; monitoring, by a mobile device used by a payor, a first communication channel for receipt from the identifier transmitter of the broadcast comprising the broadcast identifier and the first identifier corresponding to the payee device; upon receipt of the broadcast by the mobile device, determining that the broadcast identifier corresponds to a designated broadcast identifier, and in response to receipt by the mobile device of a first user input, generating an identifier notification comprising the first identifier and a second identifier corresponding to the mobile device, and transmitting the identifier notification over a second communication channel to the payment processor; in response to receipt of the identifier notification at the payment processor, associating the second identifier of the identifier notification with the first identifier of the identifier notification in a memory of the payment processor; upon receipt by a querying device of a second user input to transmit an identifier request comprising the second identifier, the payment processor receiving from the querying device the identifier request comprising the second identifier; and in response to receipt of the identifier request, retrieving the first identifier associated with the second identifier in the memory of the payment processor based on the second identifier of the identifier request, generating a transmitter notification in respect of the identifier request, and transmitting the transmitter notification to the querying device, wherein the querying device is not the mobile device.