Patent Publication Number: US-11392923-B2

Title: Method and system for enabling a payment

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation of U.S. patent application Ser. No. 15/124,661, filed Sep. 8, 2016, which is a U.S. national phase application under 35 U.S.C. § 371 of International Application No. PCT/AU2015/000312, filed on May 26, 2015 and published as WO 2015/196236 A1 on Dec. 30, 2015, which claims priority to U.S. Provisional Application No. 61/017,556, filed on Jun. 26, 2014. The content of each of these applications is incorporated herein by reference in its entirety. 
    
    
     FIELD 
     The invention relates to methods and systems involving a plurality of identifier transmitters. For example, the invention relates to a method and system for enabling a payment between a payor using a mobile device and one or more of a plurality of payees corresponding to respective ones of the identifier transmitters, and is of particular but by no means exclusive application in enabling a payment between a passenger using a smartphone in a taxi and one of a plurality of drivers of respective taxis. In another example, the invention relates to a method and system for identifying one of a plurality of service providers corresponding to respective ones of the identifier transmitters, and is of particular but by no means exclusive application in identifying one of a plurality of drivers of respective taxis. 
     BACKGROUND 
     In Australia and many parts of the world, taxi drivers (including drivers of limousines or other chauffeured vehicles) accept payment made in cash or using a charge or credit card via an electronic payment device. A receipt of payment must be provided by a driver of a taxi to a passenger of the taxi if payment for a trip is made by the passenger using a charge or credit card. The receipt must include details of the driver and details of the taxi. Payment for a trip usually takes place at the end of the trip, but it is not unusual for taxi drivers to request for payment (such as a partial upfront advance) at the beginning of the trip. It is also possible for a payment to be made during a trip. 
     There is a need for an alternative or improved method of enabling payments between passengers and drivers. 
     SUMMARY OF INVENTION 
     The invention provides a method of enabling a payment between a payor using a mobile device and one of a plurality of payees using respective payee devices, comprising: 
     monitoring a first communication channel for receipt of a broadcast of a first identifier corresponding to one of the plurality of payee devices; 
     upon receipt of the first identifier, generating an identifier notification comprising the first identifier and a second identifier corresponding to the mobile device, and transmitting the identifier notification from the mobile device to a payment processor over a second communication channel; 
     in response to receipt of the identifier notification transmitted from the mobile device at the payment processor, associating the second identifier of the identifier notification with the first identifier of the identifier notification in a payment processor memory of the payment processor; 
     generating a payment request comprising the second identifier, and transmitting the payment request from the mobile device to the payment processor; 
     in response to receipt of the payment request transmitted from the mobile device, generating a payment notification in respect of the payment request, and transmitting the payment notification from the payment processor to the payee device corresponding to the first identifier associated with the second identifier. 
     In an embodiment, the first identifier is an identifier of one of the payees or payee devices, and the second identifier is an identifier of the payor or mobile device. 
     In an embodiment, the payment request is transmitted from the mobile device to the payment processor over the second communication channel. 
     In an embodiment, the method further comprises, in response to receipt of the payment notification transmitted from the payment processor, generating payment information in respect of the payment request, and transmitting the payment information from the payee device to the payment processor. 
     In an embodiment, the method further comprises: 
     receiving a payee input to generate and transmit the payment information, 
     wherein the payment information is generated and transmitted from the payee device to the payment processor in response to receipt of the payee input. 
     In an embodiment, the method further comprises, in response to receipt of the payment information transmitted from the payee device, generating modified payment information based on the payment information, and transmitting the modified payment information from the payment processor to the mobile device. 
     In an embodiment, the method further comprises, in response to receipt of the modified payment information from the payment processor, controlling the mobile device to display the modified payment information. 
     In an embodiment, the modified payment information is displayed by an application implemented on or by the mobile device. 
     In an embodiment, the method further comprises: 
     transmitting the first identifier from the payee device to one of a plurality of first identifier transmitters; and 
     upon receipt of the first identifier from the payee device to the first identifier transmitter, broadcasting the broadcast of the first identifier from the first identifier transmitter over the first communication channel. 
     In an embodiment, the method further comprises controlling the mobile device to display a second identifier request, in response to receipt from the first identifier transmitter of the broadcast of the first identifier. 
     In an embodiment, the second identifier request comprises payee information relating to the payee device corresponding to the first identifier. 
     In an embodiment, the broadcast of the first identifier comprises a broadcast identifier, and the method further comprises determining that the broadcast identifier corresponds to a designated broadcast identifier. 
     In an embodiment, the broadcast identifier is a universally unique identifier (UUID) and the designated broadcast identifier is a designated UUID. 
     In an embodiment, the method further comprises: 
     receiving a first payor input to generate and transmit the identifier notification, 
     wherein the identifier notification is generated and transmitted from the mobile device to the payment processor in response to receipt of the first payer input. 
     In an embodiment, the method further comprises: 
     receiving a second payor input to generate and transmit the payment request, 
     wherein the payment request is generated and transmitted from the mobile device to the payment processor in response to receipt of the second payor input. 
     In an embodiment, the first communication channel is a short-range communication channel. 
     In an embodiment, the first communication channel is a Bluetooth Low Energy communication channel. 
     In an embodiment, the first communication channel has a communication range of at least 1 meter. 
     In an embodiment, the first communication channel has a maximum communication range of about 100 meters. 
     In an embodiment, the first communication channel is a maximum data rate of about 1 megabits-per-second. 
     In an embodiment, the first communication channel has a peak current consumption of at most 15 milliamperes. 
     In an embodiment, the first communication channel and the second communication channel are different communication channels. 
     In an embodiment, the second communication channel is a mobile cellular communication channel. 
     In an embodiment, the second communication channel is a wireless local area network communication channel. 
     In an embodiment, the payee devices are located in different locations. 
     In an embodiment, each of the payee devices is a smartphone. 
     In an embodiment, the mobile device is a smartphone. 
     The invention also provides a system for enabling a payment between a payor and one of a plurality of payees, comprising: 
     a plurality of payee devices for respective use by the payees, each payee device corresponding to a first identifier for broadcast over a first communication channel; 
     a mobile device for use by the payor, and arranged to:
         monitor the first communication channel for receipt of a broadcast of the first identifier corresponding to one of the payee device devices;   upon receipt of the first identifier, generate an identifier notification comprising the first identifier and a second identifier corresponding to the mobile device, and transmit the identifier notification over a second communication channel; and   generate a payment request comprising the second identifier, and transmit the payment request;       

     to a payment processor in communication with the mobile device and the payee devices, and arranged to:
         in response to receipt of the identifier notification transmitted from the mobile device over the second communication channel, associate the second identifier of the identifier notification with the first identifier of the identifier notification in a memory (for example, in a memory associated with the payment processor); and   in response to receipt of the payment request transmitted from the mobile device, generate a payment notification in respect of the payment request, and transmit the payment notification to the payee device corresponding to the first identifier associated with the second identifier.       

     In an embodiment, the first identifier is an identifier of one of the payees or payee devices, and the second identifier is an identifier of the payor or mobile device. 
     In an embodiment, the payee device corresponding to the first identifier associated with the second identifier is arranged to, in response to receipt of the payment notification transmitted from the payment processor, generate payment information in respect of the payment request, and transmit the payment information to the payment processor. 
     In an embodiment, the payee device corresponding to the first identifier associated with the second identifier is arranged to receive a payee input to generate and transmit the payment information, and the payment information is generated and transmitted from the payee device to the payment processor in response to receipt of the payee input. 
     In an embodiment, the payment processor is arranged to, in response to receipt of the payment information transmitted from the payee device, generate modified payment information based on the payment information, and transmit the modified payment information to the mobile device. 
     In an embodiment, the mobile device is arranged to, in response to receipt of the modified payment information from the payment processor, display the modified payment information. 
     In an embodiment, the modified payment information is displayed by an application implemented on or by the mobile device. 
     In an embodiment, each payee device is arranged to transmit a first identifier corresponding to the payee device to one of a plurality of first identifier transmitters, and each identifier transmitter is arranged to, upon receipt of the first identifier from a payee device to the first identifier transmitter, broadcast the first identifier received from the payee device over the first communication channel. 
     In an embodiment, the mobile device is arranged to display a second identifier request, in response to receipt from the first identifier transmitter of the broadcast of the first identifier. 
     In an embodiment, the second identifier request comprises payee information relating to the payee device corresponding to the first identifier. 
     In an embodiment, the broadcast of the first identifier comprises a broadcast identifier, and the mobile device is arranged to determine that the broadcast identifier. 
     In an embodiment, the broadcast identifier is a universally unique identifier (UUID) and the designated broadcast identifier is a designated UUID. 
     In an embodiment, the mobile device is arranged to receive a first payor input to generate and transmit the identifier notification, and 
     wherein the identifier notification is generated and transmitted from the mobile device to the payment processor in response to receipt of the first payor input. 
     In an embodiment, the mobile device is arranged to receive a second payor input to generate and transmit the payment request, wherein the payment request is generated and transmitted from the mobile device to the payment processor in response to receipt of the second payor input. 
     In an embodiment, the first communication channel is a short-range communication channel. 
     In an embodiment, the first communication channel is a Bluetooth Low Energy communication channel. 
     In an embodiment, the first communication channel has a communication range of at least 1 meter. 
     In an embodiment, the first communication channel has a maximum communication range of about 100 meters. 
     In an embodiment, the first communication channel is a maximum data rate of about 1 megabits-per-second. 
     In an embodiment, the first communication channel has a peak current consumption of at most 15 milliamperes. 
     In an embodiment, the first communication channel and the second communication channel are different communication channels. 
     In an embodiment, the second communication channel is a bile cellular communication channel. 
     In an embodiment, the second communication channel is a wireless local area network communication channel. 
     In an embodiment, the payee devices are located in different locations. 
     In an embodiment, each of the payee devices is a smartphone. 
     In an embodiment, the mobile device is a smartphone. 
     The invention also provides a payment processor for enabling a payment between a payor using a mobile device and one of a plurality of payees using respective payee devices, comprising: 
     a communication interface arranged to:
         receive, from the mobile device over a second communication channel, an identifier notification comprising a first identifier corresponding to one of the plurality of payee devices and a second identifier corresponding to the mobile device, the first identifier being previously broadcast to the mobile device over a first communication channel; and   receive, from the mobile device, a payment request comprising the second identifier;       

     an identifier associator arranged to, in response to receipt of the identifier notification transmitted from the mobile device over the second communication channel, associate the second identifier of the identifier notification with the first identifier of the identifier notification in a memory; and 
     a payment notification generator arranged to, in response to receipt of the payment request transmitted from the mobile device, generate a payment notification in respect of the payment request, for transmission to the payee device corresponding to the first identifier associated with the second identifier. 
     The invention also provides a payee device for enabling a payment between a payor using a mobile device and a payee using the payee device, comprising: 
     a communication interface arranged to:
         transmit a first identifier corresponding to the payee device, the first identifier being output by the communication interface for broadcast over a first communication channel to the mobile device, the first identifier broadcast to the mobile device being for transmission over a second communication channel to a payment processor with a second identifier corresponding to the mobile device, the first identifier transmitted to the payment processor being for association with the second identifier transmitted with the first identifier in a memory of the payment processor; and       

     receive, from the payment processor, a payment notification (i) in respect of a payment request previously transmitted from the mobile device to the payment processor and comprising the second identifier, and (ii) transmitted from the payment processor to the payee device based on the second identifier of the payment request and the association of the second identifier with the first identifier; and 
     a payment information generator arranged to, in response to receipt of the payment notification transmitted from the payment processor, generate payment information in respect of the payment request, for transmission to the payment processor. 
     The invention also provides a method of identifying one of a plurality of service providers using respective identifier transmitters, comprising: 
     monitoring a first communication channel for receipt of a broadcast of a first identifier corresponding to one of the plurality of identifier transmitters; 
     upon receipt of the first identifier, generating an identifier notification comprising the first identifier and a second identifier corresponding to a mobile device, and transmitting the identifier notification over a second communication channel to a transmitter identifying device; 
     in response to receipt of the identifier notification at the transmitter identifying device, associating the second identifier of the identifier notification with the first identifier of the identifier notification in a memory; 
     receiving from a querying device an identifier request comprising the second identifier; and 
     in response to receipt of the identifier request, generating a transmitter notification based on the first identifier associated with the second identifier in the memory, and transmitting the transmitter notification to the querying device. 
     In an embodiment, the identifier request is transmitted from the mobile device to the transmitter identifying device over the second communication channel. 
     In an embodiment, the transmitter notification comprises the first identifier associated with the second identifier in the memory. 
     In an embodiment, the method further comprises determining the location of the identifier transmitter corresponding to the first identifier associated with the second identifier in the memory, and the transmitter notification comprises data indicative of the determined location. 
     In an embodiment, the first identifier is an identifier of and broadcast by the identifier transmitter corresponding to the first identifier. 
     In an embodiment, the second identifier is an identifier of the mobile device. 
     In an embodiment, the second identifier is an identifier of a user of the mobile device. 
     In an embodiment, the identifier notification is generated and transmitted by the mobile device. 
     In an embodiment, the querying device is the mobile device. 
     In an embodiment, the method further comprises, in response to receipt of the transmitter notification at the querying device, controlling the querying device to display the identifier transmitter corresponding to the first identifier. 
     In an embodiment, the identifier transmitter corresponding to the first identifier is displayed by an application implemented on or by the querying device. 
     In an embodiment, the method further comprises controlling the mobile device to display a second identifier request, in response to receipt from the first identifier transmitter of the broadcast of the first identifier. 
     In an embodiment, the second identifier request comprises identifier transmitter information relating to the identifier transmitter corresponding to the first identifier. 
     In an embodiment, the broadcast of the first identifier comprises a broadcast identifier, and the method further comprises determining that the broadcast identifier corresponds to a designated broadcast identifier. 
     In an embodiment, the broadcast identifier is a universally unique identifier (UUID) and the designated broadcast identifier is a designated UUID. 
     In an embodiment, the method further comprises receiving a first user input to generate and transmit the identifier notification, and the identifier notification is generated and transmitted from the mobile device to the transmitter identifying device in response to receipt of the first user input. 
     In an embodiment, the method further comprises receiving a second user input to generate and transmit the identifier request (in particular, subsequent to the second identifier of the identifier notification being associated with the first identifier of the identifier notification in the memory), and the identifier request is generated and transmitted from the querying device to the transmitter identifying device in response to receipt of the second user input. 
     In an embodiment, the first communication channel is a short-range communication channel. 
     In an embodiment, the first communication channel is a Bluetooth Low Energy communication channel. 
     In an embodiment, the first communication channel has a communication range of at least 1 meter. 
     In an embodiment, the first communication channel has a maximum communication range of about 100 meters. 
     In an embodiment, the first communication channel is a maximum data rate of about 1 megabits-per-second. 
     In an embodiment, the first communication channel has peak current consumption of at most 15 milliamperes. 
     In an embodiment, the first communication channel and the second communication channel are different communication channels. 
     In an embodiment, the second communication channel is a mobile cellular communication channel. 
     In an embodiment, the second communication channel is a wireless local area network communication channel. 
     In an embodiment, the identifier transmitters are located in different locations. 
     In an embodiment, the mobile device is a smartphone. 
     The invention also provides a system for identifying one of a plurality of service providers, comprising: 
     a plurality of identifier transmitters for respective use by the service providers, each identifier transmitter arranged to broadcast a first identifier over a first communication channel; 
     a mobile device arranged to:
         monitor the first communication channel for receipt of a broadcast of the first identifier corresponding to one of the plurality of identifier transmitters; and   upon receipt of the first identifier, generate an identifier notification comprising the first identifier and a second identifier corresponding to the mobile device, and transmit the identifier notification over a second communication channel;       

     a transmitter identifying device arranged to:
         receive the identifier notification transmitted from the mobile device over the second communication channel;   associate the second identifier of the identifier notification with the first identifier of the identifier notification in a memory;   receive from the querying device an identifier request comprising the second identifier;   generate a transmitter notification based on the first identifier associated with the second identifier in the memory, and transmit the transmitter notification to the querying device.       

     In an embodiment, the querying device is the mobile device. 
     In an embodiment, the transmitter notification comprises the first identifier associated with the second identifier in the memory. 
     In an embodiment, the transmitter identifying device is arranged to determine the location of the identifier transmitter corresponding to the first identifier associated with the second identifier in the memory, and the transmitter notification comprises data indicative of the determined location. 
     In an embodiment, the first identifier is an identifier of and broadcast by the identifier transmitter corresponding to the first identifier. 
     In an embodiment, the second identifier is an identifier of the mobile device. 
     In an embodiment, the second identifier is an identifier of a user of the mobile device. 
     In an embodiment, the mobile device is arranged to generate and transmit the identifier notification. 
     In an embodiment, the querying device is arranged to, in response to receipt of the transmitter notification, display the identifier transmitter corresponding to the first identifier. 
     In an embodiment, the identifier transmitter corresponding to the first identifier is displayed by an application implemented on or by the querying device. 
     In an embodiment, the mobile device is arranged to display a second identifier request, in response to receipt from the first identifier transmitter of the broadcast of the first identifier. 
     In an embodiment, the second identifier request comprises identifier transmitter information relating to the identifier transmitter corresponding to the first identifier. 
     In an embodiment, the broadcast of the first identifier comprises a broadcast identifier, and the mobile device is arranged to determine that the broadcast identifier corresponds to a designated broadcast identifier. 
     In an embodiment, the broadcast identifier is a universally unique identifier (UUID) and the designated broadcast identifier is a designated UUID. 
     In an embodiment, the mobile device is arranged to receive a first user input to generate and transmit the identifier notification, and the identifier notification is generated and transmitted from the mobile device to the transmitter identifying device in response to receipt of the first user input. 
     In an embodiment, the querying device is arranged to receive a second user input to generate and transmit the identifier request, and the identifier request is generated and transmitted from the querying device to the transmitter identifying device in response to receipt of the second user input. 
     In an embodiment, the first communication channel is a short-range communication channel. 
     In an embodiment, the first communication channel is a Bluetooth Low Energy communication channel. 
     In an embodiment, the first communication channel has a communication range of at least 1 meter. 
     In an embodiment, the first communication channel has a maximum communication range of about 100 meters. 
     In an embodiment, the first communication channel is a maximum data rate of about 1 megabits-per-second. 
     In an embodiment, the first communication channel has a peak current consumption of at most 15 milliamperes. 
     In an embodiment, the first communication channel and the second communication channel are different communication channels. 
     In an embodiment, the second communication channel is a mobile cellular communication channel. 
     In an embodiment, the second communication channel is a wireless local area network communication channel. 
     In an embodiment, the identifier transmitters are located in different locations. 
     In an embodiment, the mobile device is a smartphone. 
     The invention also provides a transmitter identifying device for identifying one of a plurality of service providers using respective identifier transmitters, comprising: 
     a communication interface arranged to:
         receive, from a mobile device over a second communication channel, an identifier notification comprising a first identifier corresponding to one of the plurality of identifier transmitters and a second identifier corresponding to the mobile device, the first identifier being previously broadcast to the mobile device over a first communication channel; and   receive, from a querying device, an identifier request comprising the second identifier;       

     an identifier associator arranged to, in response to receipt of the identifier notification transmitted from the mobile device over the second communication channel, associate the second identifier of the identifier notification with the first identifier of the identifier notification in a memory; and 
     a transmitter notification generator arranged to, in response to receipt of the identifier request transmitted from the querying device, generate a transmitter notification based on the first identifier associated with the second identifier in the memory, for transmission to the querying device. 
     The invention also provides a mobile device for identifying one of a plurality of service providers using respective identifier transmitters, comprising: 
     a communication interface arranged to monitor a first communication channel for receipt of a broadcast of a first identifier corresponding to one of the plurality of identifier transmitters; 
     an identifier notification generator arranged to, upon receipt of the first identifier, generate an identifier notification comprising the first identifier and a second identifier corresponding to a mobile device, and control the communication interface to transmit the identifier notification over a second communication channel to a transmitter identifying device, the first identifier transmitted to the transmitter identifying device being for association with the second identifier transmitted with the first identifier in a memory of the transmitter identifying device; and 
     an identifier request generator arranged to generate an identifier request comprising the second identifier, and control the communication interface to receive a transmitter notification generated based on the first identifier associated with the second identifier in the memory. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order that the invention may be more clearly ascertained, embodiments will now be described, by way of example, with reference to the accompanying drawings, in which: 
         FIG. 1  is a schematic diagram of the physical architecture of an embodiment of the system for enabling a payment between a payor using a mobile device and one of a plurality of payees using respective payee devices; 
         FIG. 2  is a schematic diagram of the functional components of the system of  FIG. 1 ; 
         FIG. 3  is a flow chart of an embodiment of the method of enabling a payment, carried out using the system of  FIGS. 1 and 2 ; 
         FIG. 4  is a flow chart of additional steps that may optionally precede the method of  FIG. 3 ; 
         FIG. 5  is a flow chart of additional steps that may optionally follow the method of  FIG. 3 ; 
         FIG. 6  is a schematic diagram of the physical architecture of an embodiment of the system for identifying one of a plurality of identifier transmitters; 
         FIG. 7  is a schematic diagram of the functional components of the system of  FIG. 6 ; and 
         FIG. 8  is a flow chart of an embodiment of the method of identifying one of a plurality of identifier transmitters, carried out using the system of  FIGS. 1 and 2 . 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIGS. 1 to 8  of the drawings, there is shown a system  10 ,  1000  comprising a plurality of identifier transmitters  17  and a mobile device  13 ,  1300 . As described in further detail below, the system  10 ,  1000  is arranged to associate an identifier corresponding to the mobile device  13 ,  1300 . For example, in an embodiment of the system  10  as illustrated in  FIGS. 1 to 5 , the system  10  is arranged to associate an identifier corresponding to one of a plurality of payee devices  19  in communication with respective ones of the identifier transmitters  17  with an identifier corresponding to the mobile device  13  in order to enable a payment between a payor using the mobile device and one or more of a plurality of payees corresponding to respective ones of the identifier transmitters  17 . In another example, an alternative embodiment of the system  1000  as illustrated in  FIGS. 6 to 8  is arranged to associate an identifier corresponding to one of the identifier transmitters  17  with an identifier corresponding to the mobile device  1300  in order to enable an identification of one of a plurality of service providers corresponding to respective ones of the identifier transmitters  17 . It is envisaged the features from an embodiment of the system  10 ,  1000  may be incorporated into another embodiment of the system  10 ,  1000 . For example, in the alternative embodiment of the system  1000  illustrated in  FIGS. 6 to 8 , the system  1000  may alternatively be arranged to associate an identifier corresponding to one of a plurality of intermediaries (such as the payee devices  19  of the embodiment of the system  10  illustrated in  FIGS. 1 to 5 ) in communication with respective ones of the identifier transmitters  17  (rather than an identifier corresponding to one of the identifier transmitters  17 ) with an identifier corresponding to the mobile device  1300  in order to enable an identification of one of a plurality of service providers corresponding to respective ones of the identifier transmitters  17 . 
     Turning now to  FIGS. 1 to 5  of the drawings, there is shown embodiment of a system  10  for enabling a payment between a payor (a passenger of a taxi) using a mobile device  13  (such as smartphone in the form of an iPhone (trademark) developed by Apple Inc.) and one or more payees (in particular, taxi drivers) using respective payee devices  19 . The system  10  comprises a payment processor  18  in communication with the mobile device  13 . The payment processor  18  is configured to, upon receipt from the mobile device  13  of a first identifier (such as a driver identifier (ID)) corresponding to one of the payee devices  19  and a second identifier (such as a media access control (MAC) address or Device ID of an iPhone) corresponding to the mobile device  13 , associate the first identifier with the second identifier in a memory  16 . The payment processor  18  is also configured to, in response to receipt of a payment request transmitted from the mobile device  13 , generate a payment notification in respect of the payment request, and transmit the payment notification to the payee device  19  corresponding to the first identifier associated with the second identifier in the memory  16 . Advantageously, the system  10  facilitates an automatic payment from the payor using the mobile device  13  to one of the payees using any of the payee devices  19 , once the first identifier is associated with the second identifier. Another advantage is that payment may be made by the payor to a payee without requiring a direct connection between the mobile device  13  and the payee device  19  to be established. A further advantage is that the system  10  allows an offer, coupon or discount or some other benefit to be managed and applied to any payment by the payment processor  18  at a central location (rather than by payee devices  19  at distributed locations). 
     It is envisaged that the payment processor  18  is typically implemented by a computing device such as a computer server (which may be located remotely or via “cloud computing”), a desktop personal computer, a portable computer (such as a laptop computer, a notebook computer or a tablet computer), or a mobile computing device (such as a smartphone), a programmable circuit etc. Persons skilled in the art will appreciate that the payment processor  18  may be implemented by multiple computing devices such that each computing device implements only a part or parts of the payment processor  18 . 
       FIG. 1  is a schematic diagram of the physical architecture of an embodiment of the system  10 . The system  10  comprises a payment processor  18  connected to a payment processor memory  16  and a network  15  in the form of the Internet. The system  10  also comprises a plurality of payee devices  19  for use by respective payees, each of the payee devices  19  being in wireless communication with a respective one of a plurality of identifier transmitters  17 . In this embodiment, the system  10  takes advantage of the iBeacon (trademark) arrangement and the Passbook application developed by Apple Inc. Thus, each of the payee devices  19  is a smartphone in the form of an iPhone (trademark) located in a taxi, and each of the identifier transmitters  17  is an iBeacon that is adapted to broadcast notifications using a short range communication standard such as Bluetooth Low Energy (BLE) or Bluetooth Smart (trademark). The use of BLE or Bluetooth Smart is advantageous in that it has a range that is suitable for broadcasting signals within a taxi, a maximum data rate that is high enough for broadcasting iBeacon signals (about 1 megabits-per-second), and relatively low peak current consumption (about 15 milliamperes). The system  10  also comprises a mobile device  13  for use by the payor to receive the notifications broadcast from the identifier transmitters  17 , In this embodiment, the mobile device  13  like each of the payee devices  19 —is a smartphone in the form of an iPhone. The mobile device  13  and each of the payee devices  19  can be in wireless communication with the network  10  via a mobile communication network such as a Long Term Evolution (LTE) network or alternatively a wireless local area network such as Wi-Fi. 
     In this embodiment of the system  10 , the payee devices  19 , the identifier transmitters  17  and the mobile device  13  are devices that are compatible with the Passbook (trademark) application by Apple Inc. However, it is envisaged that the system  10  may alternatively or additionally comprise devices that are not compatible with the Passbook (trademark) application by Apple Inc. but are compatible with equivalent products such as Google Wallet (trademark). For example, it is envisaged that an alternative embodiment of the system  10  may comprise payee devices  19  in the form of smartphones where each identifier transmitter  17  is integrated within a smartphone (rather than in a separate device such as an iBeacon), for example, by an application (in particular, a proprietary application supplied or provided by a service provider such as a Payment Service Provider (PSP) or a taxi company) installed on the smartphone. 
     It is envisaged that an alternative embodiment of the system  10  may comprise more than one mobile device  13 . Also, the system  10  may comprise one or more payee devices  19 . Also, it is envisaged that an alternative embodiment of the system  10  may take advantage of an arrangement other than the iBeacon arrangement, or an application (such as a proprietary application provided or supplied by a service provider such as a PSP or a taxi company) in addition to or other than the Passbook application. In this respect, the notifications from the identifier transmitters  17  may not be broadcast using BLE or Bluetooth Smart as specified by the iBeacon arrangement, but using other short range communication standards such as Near Field Communication (NFC) as specified by an alternative arrangement. In this respect, a person skilled in the art will appreciate that any alternative communication standard having a suitable range (for example, one having a range of at least 1 meter, or one having a maximum of about 100 meters) to broadcast the notifications within a taxi to a passenger of the taxi may be used. Examples of such alternative communication standards include wireless local area network (Wi-Fi) standards, and mobile or cellular communication standards such as LTE or UMTS. It is also envisaged that other communication methods such as barcodes, for example, Quick Response (QR) codes may be used in other embodiments. 
     Persons skilled in the art will appreciate that the payment processor memory  16  may be implemented in a single device (for example, as part of the payment processor  18 ) or in separate devices. 
     The system  10  comprises a number of functional components for enabling a payment between a payor using the mobile device  13  and each of the payees using respective payee devices  19 . It is envisaged that the functional components are typically implemented by a processor of a device executing program code and data stored in a memory of the device. However, persons skilled in the art will appreciate that this need not be the case. For example, one or more of the components could be implemented in an alternative manner, for example, as a dedicated circuit.  FIG. 2  is a schematic diagram showing the functional components of the system  10 . In  FIG. 2 , only one of the identifier transmitters  17  and only one of the payee devices  19  are shown. 
     Beginning first with the payment processor  18  of the system  10 , the payment processor  18  comprises a processor  89  and a communication interface  88 . The processor  89  of the payment processor  18  is arranged to implement functional components in the form of an identifier associator  83 , a payment notification generator  85 , and a modified payment information generator  87  based on program code and data stored in the payment processor memory  16  connected to the payment processor  18 . 
     As indicated above, the identifier transmitter  17  is adapted to broadcast notifications using BLE or Bluetooth Smart as specified according to the iBeacon arrangement. In particular, the identifier transmitter  17  is arranged to broadcast an identifier (a payee device identifier) of the payee device  19  over a BLE or Bluetooth Smart communication channel. It is envisaged that the identifier transmitter  17  may alternatively broadcast an identifier of a payee, or any identifier corresponding to either a payee device  19  or a payee. 
     In use, the payee device identifier is provided to the identifier transmitter before the payee device identifier is broadcast by the identifier transmitter  17 . It is envisaged that the payee device identifier may be provided to the identifier transmitter  17  in different ways. For example, the payee device identifier may be output by a communication interface  98  of the payee device  19  (or some other device such as another smartphone) to the identifier transmitter  17  using BLE or Bluetooth Smart. In another example, the payee device identifier may be provided to the identifier transmitter  17  by connecting the identifier transmitter  17  to a computer (for example, a desktop computer or a laptop computer) via a Universal Serial Bus (USB), and outputting the payee device identifier from the computer to the identifier transmitter  17  via the USB connection. More details will be provided below with reference to  FIGS. 3 to 5  (for example, with reference to item  380  of  FIG. 4 ). 
     The mobile device  13  is adapted to monitor the BLE or Bluetooth Smart communication channel for receipt of a broadcast of a payee device identifier. As indicated above, the mobile device  13  is an iPhone in this embodiment. An application in the form of the Passbook application by Apple Inc. is installed in the mobile device  13 . In use, the Passbook application monitors the BLE or Bluetooth Smart communication channel for receipt of a broadcast signal that includes a broadcast identifier in the form of a universally unique identifier (UUID), and a payee device identifier in the form of an identifier of a driver of a taxi (a driver ID), an identifier of the so taxi (a vehicle ID), or both the driver ID and the vehicle ID. 
     For example, the broadcast signal may include: 
     Name: Payment Service Provider (PSP) name 
     UUID: Designated UUID 
     Major value: Driver ID 
     Minor value: Vehicle ID 
     In the above example of the broadcast signal, the Major and Minor values represent settings of an iBeacon that are configurable by a service provider (such as the PSP) to differentiate iBeacons in different taxis. 
     Upon receipt by the mobile device  13  of the broadcast signal, the mobile device  13  determines whether the broadcast identifier (that is, the UUID) of the broadcast signal matches or corresponds to a designated broadcast identifier (that is, a designated UUID). In response to a determination that the UUID of the broadcast signal corresponds to a designated UUID, the mobile device  13  displays an identifier request in the form of a notification to display information relating to the driver of the taxi and/or the taxi (that is, the taxi driver and/or taxi corresponding to the payee device identifier of the broadcast signal transmitted by the identifier transmitter  17 ), When the mobile device  13  receives from the payor (that is, the passenger) a payor input to display the information relating to the driver of the taxi and/or the taxi, the mobile device  13  generates an identifier notification comprising the payee device identifier and an identifier (a payor identifier) corresponding to either the mobile device  13  or the payor such as an identifier of the payor or an identifier of the mobile device  13  (such as a media access control (MAC) address or device ID of the mobile device  13 ), and transmits the identifier notification over a communication channel through the LTE network and the Internet  15  to the payment processor  18 . Then, the mobile device  13  generates and displays to the payor the information relating to the driver of the taxi and/or the taxi via the Passbook app (or alternatively via an equivalent app such as Google Wallet, a proprietary application provided or supplied by a service provider such as a PSP or a taxi company, or a web browser app in alternative embodiments). It is envisaged that the information relating to the driver of the taxi and/or the taxi may be generated by the mobile device  13  in different ways. For example, the information may be generated by retrieving the information from the payment processor  18 . In another example, the information may be generated by retrieving the information from a memory of the mobile device  13 . 
     In this embodiment, the information relating to the driver of the taxi displayed via the Passbook app on the mobile device  13  includes information relating to making a payment via the payment processor  18 , The information relating to making a payment via the payment processor  18  includes an offer, coupon or discount for payments made via the payment processor  18 . However, it is envisaged that, in an alternative embodiment of the system  10 , the information relating to making a payment via the payment processor  18  may not include such an offer, coupon or discount. Depending on the embodiment, the information relating to making a payment may be in the form of a uniform resource locator (URL) displayed either via the Passbook app (or alternatively via an equivalent app such as Google Wallet, a proprietary application provided or supplied by a service provider such as a PSP or a taxi company, or a web browser application implemented by the mobile device  13 ). When the mobile device  13  receives from the payor a payor input to display the information relating to making a payment, the mobile device  13  takes that payor input as an input to generate and transmit a payment request, and generates a payment request comprising the payor identifier. Then, the mobile device  13  transmits the payment request over a communication channel through the LTE network and the Internet  15  to the payment processor  18 . In this embodiment, the payment request includes information relating to the offer, coupon or discount for payments made via the payment processor  18 . Depending on the embodiment, the payment request and the identifier notification may be transmitted over the same communication channel through the LTE network and the Internet  15  connecting the mobile device  13  to the payment processor  18 , or over different communication channels, through different network or networks, or over different communication channels and through different network or networks. For example, either the payment request or the identifier notification may alternatively be transmitted through a wireless local area network (rather than the LTE network) and the Internet  15 . 
     The communication interface  88  of the payment processor  18  is adapted to receive the identifier notification transmitted from the mobile device  13 , and the payment request transmitted from the mobile device  13 . The identifier associator  83  is arranged to, in response to receipt by the communication interface  88  of the identifier notification transmitted from the mobile device  13 , associate the payee identifier of the identifier notification with the payor identifier of the identifier notification in the payment processor memory  16  connected to the payment processor  18 . The payment notification generator  85  is adapted to, in response to receipt by the communication interface  88  of the payment request transmitted from the mobile device  13 , generate a payment notification in respect of the payment request, and transmit the payment notification to the payee device  19  corresponding to the payee identifier associated with the payor identifier in the payment processor memory  16  connected to the payment processor  18 . 
     Turning now to the functional components of the payee device  19  of the system  10 , the payee device  19  comprises a processor  99 , a communication interface  98  and a memory  96 . The processor  99  of the payee device  19  is arranged to implement a functional component in the form of a payment information generator  93  based on program code and data stored in the memory  96  of the payee device  19 . 
     The communication interface  98  of the payee device  19  is adapted to receive the payment notification transmitted from the payment processor  18 . The payment information generator  93  is arranged to generate payment information in respect of the payment request, and transmit the payment information over a communication channel through the LTE network and the Internet  15  to the payment processor  18 . 
     In use, the payee device  19  displays to the payee (that is, the taxi driver) a request to make a payee input, in response to receipt by the communication interface  98  of the payee device  19  of the payment notification transmitted from the payment processor  18 . As indicated above, the payee device  19  is a smartphone in the form of an iPhone. In this embodiment, the request to make a payee input is a request to input the fare for a trip (that is, the charge or the cost of the trip) displayed by an application installed on the iPhone 19. Upon receipt of the payee input, the payment information generator  93  of the payee device  19  generates payment information in respect of the payment request based on the payee input. Then, the payment information generator  93  transmits the generated payment information over a communication channel through the LTE network and the Internet  15  to the payment processor  18 . 
     The communication interface  88  of the payment processor  18  is adapted to receive the payment information transmitted from the payee device  19 . The modified payment information generator  87  of the payment processor  18  is adapted to, in response to receipt by the communication interface  88  of the payment processor  18  of the payment information transmitted from the payee device  19 , generate modified payment information based on the payment information, and transmit the modified payment information to the mobile device  13 . In this embodiment, the modified payment information is generated based on not only the payment information transmitted from the payee device  19 , but also the information relating to the offer, coupon or discount for payments made via the payment processor  18 . Thus, the modified payment information includes an offered, redeemable or discounted fare compared to the fare input by the payee (that is, the taxi driver). It is envisaged that the modified payment information is transmitted from the payment processor  18  over a communication channel through the Internet  15  and the LTE network connecting the payment processor  18  to the mobile device  13 , but a person skilled in the art will appreciate that the modified payment information may be transmitted via an alternative network or networks. Also, it is envisaged that, in an alternative embodiment, the fare input by the payee may be modified into an offered, redeemable or discounted fare by a proprietary application provided or supplied by a service provider such as a PSP or a taxi company. 
     When the mobile device  13  receives the modified payment information from the payment processor  18 , the mobile device  13  displays the modified payment information including the offered fare, redeemable fare or discounted fare. In this embodiment, the modified payment information is displayed on a webpage via a web browser application implemented by the mobile device  13 . However, it is envisaged that the modified payment information may be alternatively displayed, for example, by another application implemented by the mobile device  13 , for example, a proprietary application provided or supplied by a service provider such as a PSP or a taxi company, a payment application provided or supplied by a payment service provider (PSP), Google Wallet, a web browser app etc. 
     In this embodiment, modified payment information is generated by the payment processor  18  to apply any offer, coupon or discount, after payment information is received by the payment processor  18 . However, it is envisaged that, in an alternative embodiment, an offer, coupon or discount may be applied before the modified payment information is generated by the payment processor  18 . For example, in an alternative embodiment, the payment notification generated by the payment processor  18  may include information relating to an offer, coupon or discount such that the payee (that is, the taxi driver) may apply the offer, coupon or discount before payment information is generated and transmitted from the payee device  19  to the payment processor  18 . 
     It is envisaged that payment information may be generated and transmitted from a payee device  19  to the payment processor  18  before commencement of a trip, during a trip or alter the completion of a trip. 
     It is envisaged that the broadcast signal by the identifier transmitter  17  may include information other than the broadcast identifier and the payee identifier. For example, the broadcast signal may include details about the driver of the taxi, the taxi itself, any affiliated organizations (such as the company providing or delivering the taxi or transportation service), related or unrelated advertisements, and an option to pay for a trip or the transportation service. 
     It is envisaged that an application or applications may be installed in the mobile device  13  used by the payor (that is, the passenger of the taxi) to provide the payor with an option or multiple options to make a payment in respect of a trip or transportation service. As indicated above, it is envisaged that the payee device  13  is notified if a payor takes up an option to make a payment in respect of a trip or transportation service using such an application or applications. In this respect, it is envisaged that such an option or options may include making a payment on a website via a web browser application, a proprietary application provided or supplied by a service provider such as a PSP or a taxi company, a payment application that may be previously installed on the mobile device. Also, it is envisaged that a payor may also decide to manually make a payment using cash or a point of sale payment device. It is also envisaged that a notification such as an email or short messaging service (SMS) message may be transmitted to the payor, the payee, or both the payor and the payee, upon approval or completion of a payment. 
     Also, it is envisaged that an application or applications may be installed in the payee device  19  used by the payee (that is, the driver of the taxi) to enable the payee to receive a payment in respect of a trip or transportation service. An example of such an application or applications is described below with reference to  FIGS. 3 to 5 . 
     Also, it is envisaged that the payment processor  18  may be additionally configured to complete any payment made by the payor using the mobile device  13 . For example, a payment made by the payor using the mobile device  13  may be first received by a PSP operating the payment processor  18  before being forwarded to the payee (for example, a payee-specified bank account). In this respect, the payment processor  18  may be additionally or alternatively configured to deduct any fees before forwarding payment to the payee. 
       FIG. 3  is a flow chart of an embodiment of the method of enabling a payment, carried out using the system of  FIGS. 1 and 2 . As indicated in the figure, additional steps may precede or follow the steps illustrated in the figure. These additional steps are described in more detail below with reference to  FIGS. 4 and 5 . 
     At step  100 , an application of the mobile device  13  (that is, the Passbook application installed in the iPhone of a passenger of a taxi, or alternatively a proprietary application provided or supplied by a service provider such as a PSP or a taxi company) monitors a communication channel in the form of a BLE or Bluetooth Smart communication channel for receipt of a broadcast signal from an identifier transmitter  17  (that is, an iBeacon), the broadcast signal comprising a broadcast identifier in the form of a UUID, and a payee device identifier in the form of a driver ID and a vehicle ID. 
     At step  110 , the Passbook application (or alternatively the proprietary application mentioned at step  100 ) installed in the mobile device  13  determines whether or not the UUID of the broadcast signal matches or corresponds to a designated UUID. If the mobile device  13  determines that the UUID of the broadcast signal does not match or correspond to the designated UUID, the mobile device  13  monitors the communication channel for receipt of another broadcast signal. Otherwise, if the mobile device  13  determines that the UUID of the broadcast signal matches or corresponds to the designated UUID, the mobile device  13  displays an identifier request in the form of a notification (such as a pop-up window if the mobile device  13  is being used by the payee, or a notice on a lock screen displayed by the mobile device  13  if the mobile device  13  is not being used by the payee) to display information relating to a payee, for example, a notification to display via the Passbook application a pass comprising information relating to the driver of the taxi, or alternatively a notification to display the information relating to the driver of the taxi via the proprietary application mentioned at step  100 . As indicated above, it is envisaged that the information relating to a payee may include other information including information relating to the taxi, an affiliated transportation company or PSP, an option to pay and/or redeem an offer and/or discount by making a payment via the payment processor  18  etc. 
     If the mobile device  13  does not receive an input to display the pass, the mobile device  13  continues to display the notification to display information relating to a payee, until the mobile device  13  no longer receives the broadcast signal from the identifier transmitter  17 . 
     At step  120 , the mobile device  13  receives an input from the payor (that is, the passenger in the taxi) using the mobile device  13  to display via the Passbook application (or alternatively, via the proprietary application mentioned at step  100 ) the pass comprising information relating to the driver of the taxi (that is, to display the identifier request). 
     At step  130 , the mobile device  13  displays the identifier request, that is, displays via the Passbook application (or alternatively, via the proprietary application mentioned at step  100 ) the pass comprising information relating to the driver of the taxi including information relating to any discount for making a payment via the payment processor  18 . In this embodiment, the information relating to a discount for making a payment via the payment processor  18  includes a proprietary app download or URL for initiating a payment via the payment processor  18 . The mobile device  13  also generates an identifier notification comprising the payee device identifier (that is, the driver ID and the vehicle ID of the broadcast signal from the iBeacon  17 ) and a MAC address or device ID (a payor identifier) of the mobile device  13 , and transmits the identifier notification over a communication channel through the LTE network and the Internet  15  to the payment processor  18 . 
     At step  140 , the payment processor  18  associates the MAC address or device ID (the payor identifier) of the identifier notification with the driver ID and the vehicle ID (that payee identifier) of the identifier notification in the payment processor memory  16  connected to the payment processor  18 . 
     As indicated above, the identifier request displayed by the mobile device  13  via the Passbook application installed on the mobile device  13  includes a URL for initiating a payment which can be made, for example, via the payment processor  18  or some other payment processor. At step  150 , the payor accesses the URL to initiate a payment, for example, by clicking the URL. As indicated above, it is envisaged that, in an alternative embodiment, the identifier request (that is, the information relating to the driver of the taxi) could alternatively be displayed via the proprietary application mentioned at step  100 . In such an alternative embodiment, the proprietary application may be used by the payor to initiate the payment at step  150 . 
     At step  160 , a payment request comprising the payer identifier (that is, the MAC address or device ID of the mobile device or iPhone 13) is generated and transmitted from the mobile device  13  to the payment processor  18 . In this embodiment, the payment request may include information relating to the discount for payments made via the payment processor  18 . 
     At step  170 , the payment processor  18  receives the payment request from the mobile device  13 , and retrieves from the payment processor memory  16  the payee identifier associated with the received payor identifier (that is, the MAC address or device ID of the payment request received from the mobile device  13 ). Then, the payment processor  18  generates a payment notification in respect of the payment request, and transmits the payment notification to the payee device  19  corresponding to the associated payee identifier. 
     At step  180 , in response to receipt by the communication interface  98  of the payee device  19  of the payment notification transmitted from the payment processor  18 , the payee device  19  displays to the payee (that is, the taxi driver) a request to make a payee input, and an input to generate and transmit payment information is received by the payee device  19  when the payee inputs the fare for a trip. As indicated above, depending on the embodiment, the fare input by the payee may or may not take into account any offer, coupon or discount. 
     At step  190 , the payee device  19  generates the payment information based on the fare input by the payee, and transmits the generated payment information to the payment processor  18 . 
     At step  200 , the payment processor  18  receives the payment information from the payee device  19 , and generates modified payment information based on the received payment information and the information relating to any offer or discount for payments made via the payment processor  18  included in the payment request previously transmitted at step  160 . Then, the payment processor  18  transmits the modified payment information to the mobile device  13 . 
     As indicated in the  FIG. 3 , additional steps may optionally precede the steps illustrated in the  FIG. 3 . These optional preceding steps are described in more detail below with reference to  FIG. 4 . 
     At step  300 , a designated UUID is defined for enabling a payment from a payor to a payee. At step  330 , the payee device  19  used by the payee (that is, the driver of the taxi using the payee device  19 ) is provided or supplied with the designated UUID. In this embodiment, the designated UUID is provided to a payee device  19  when the taxi driver using the payee device  19  downloads a payment application provided by a PSP from an application store in the form of the iTunes (trademark), installs the payment application on the payee device, and creates an account with the PSP and provides bank account details to receive payments from the PSP. Persons skilled in the art will appreciate that creating and installing the payment application may involve steps such as entering and authenticating payee details such as the bank details of the payee. 
     At step  350 , the mobile device  13  used by the payor is provided or supplied with a pass compatible with the Passbook application implemented on the mobile device  13 . As indicated above, the pass corresponds to an offer or coupon that may be from an affiliated transportation company, a PSP etc. It is envisaged that the pass may be provided to the mobile device  13  via different ways including email, social media, SMS. Bluetooth, Ethernet, Wi-Fi, QR codes etc. As indicated above, the pass remains dormant (but active) in the mobile device  13  until the mobile device  13  receives a broadcast signal corresponding to a designated broadcast identifier such as a designated UUID. As indicated above, the mobile device  13  may, in an alternative embodiment, receive an equivalent of the pass that is compatible with an alternative to the Passbook application supplied by an affiliated transportation company, a payment service provided (PSP) etc. 
     At step  380 , the designated UUID is provided to identifier transmitter  17  in communication with the payee device  19 . The identifier transmitter  17  is a standalone device (specifically, an iBeacon) in this embodiment. However, as indicated above, it is envisaged that the identifier transmitter  17  may not be a standalone device. In particular, the identifier transmitter  17  may be the payee device  19  (or a part of the payee device  19 ) as indicated above. 
     At step  390 , a broadcast signal comprising a broadcast identifier in the form of a UUID and a payee identifier (such as a Driver ID or a vehicle ID) is broadcast by the identifier transmitter  17 . As indicated above, the identifier transmitter is an iBeacon, and the broadcast signal is broadcast using a BLE or Bluetooth Smart communication channel. Below is an example of details included in the broadcast signal: 
     Name: PSP name 
     UUID: Designated UUID 
     Major value: Driver ID 
     Minor value: Vehicle ID 
     As indicated above, it is envisaged that the identifier transmitter may not be an iBeacon, and the broadcast signal may alternatively or additionally be broadcast using other communication channels such as a Wi-Fi communication channel. Also, depending on the embodiment, the payee identifier and the broadcast identifier may be broadcast separately from different devices. For example, the broadcast identifier (that is, the UUID) may be broadcast by the identifier transmitter  17  and the payee identifier (that is, the Driver ID and/or the vehicle ID) may be broadcast by the payee device  19 . 
     As indicated in the  FIG. 3 , additional steps may optionally follow the steps illustrated in the  FIG. 3 . These optional following steps are described in more detail below with reference to  FIG. 5 . 
     At step  210 , the mobile device  13  displays a discounted fare based on the modified payment information transmitted from the payment processor  18  to the mobile device  13  at step  200  of  FIG. 3 . In this embodiment, the payor can accept the discounted fare (that is, accept to pay the discounted fare for the trip), for example, by pressing an on screen button, a swiping action etc. As indicated above, it is envisaged that, in an alternative embodiment, modification of payment information may be performed by a proprietary application provided or supplied by a service provider such as a PSP or a taxi company. That is, the fare input by the payee may be modified into an offered, redeemable or discounted fare by a proprietary application in an alternative embodiment. In such an alternative embodiment, at step  210 , the mobile device  13  may alternatively display a discounted fare (or offered fare, redeemed fare etc.) based on payment information that is modified by the proprietary application (rather than payment information that is modified by and transmitted from the payment processor  18 ). For example, a proprietary application installed on the mobile device  13  may apply a discount voucher from a pass in the Passbook application, before displaying a discounted fare at step  210 . 
     At step  230 , upon acceptance of the discounted fare, the mobile device  13  detects whether or not there is an application (a pre-installed application) installed on the mobile device  13  for making a payment of the discounted fare. In this embodiment, the pre-installed application is provided by the bank of the payor. However, it is envisaged that the pre-installed application may alternatively be provided by another entity including a service provider (such as a taxi company), a credit or charge card issuer, a PSP such as PayPal, a mobile device hardware provider, a mobile device operating system provider etc. 
     At step  250 , upon detection by the mobile device  13  that there is a pre-installed application for making a payment of the discounted fare, the mobile device  13  provides information including payer details to the pre-installed application. In this respect, it is envisaged that other information such as payee details (such as specific merchant details for making a payment to the relevant payee) or the preferred payment method of the payor (for example, via a preferred credit card) may be additionally or alternatively provided to the pre-installed application. 
     At step  280 , upon detection by the mobile device  13  that there is no pre-installed application for making a payment of the discounted fare, the mobile device  13  automatically downloads a new application provided by a PSP, installs the new application on the mobile device  13 , and provides information such as payor and payee details to the new application for paying the discounted fare. A person skilled in the art will appreciate that it may be necessary to create an account and/or specify a preferred payment method or methods before making the payment. 
     At step  290 , upon payment of the discounted fare, a receipt or acknowledgement of payment is transmitted (for example, via email or SMS) to the mobile device  13  and/or the payee device  19 , It is envisaged that the receipt or acknowledge may also be displayed by the mobile device  13 , the payee device  19 , or both the mobile device  13  and the payee device  19 , upon receipt of the receipt or acknowledgement. 
     Turning now to  FIGS. 6 to 8  of the drawings, there is shown an embodiment of a system  1000  for identifying one of a plurality of service providers (such as taxi drivers). The system  1000  comprises a plurality of identifier transmitters  17  (such as a plurality of iBeacons) located at different locations for respective use by the service providers (in particular, in a plurality of taxis respectively associated with the taxi drivers), and a transmitter identifying device  1800  in communication with a mobile device  1300  (such as smartphone in the form of an iPhone) and a querying device (which is the mobile device  1300  in this embodiment, but may be another device in an alternative embodiment). The transmitter identifying device  1800  is configured to, upon receipt from the mobile device  1300  of a first identifier (such as a taxi driver identifier) corresponding to one of the identifier transmitters  17  and a second identifier (such as a MAC address or device ID of an iPhone) corresponding to the mobile device  1300 , associate the first identifier with the second identifier in a memory  1600 . The transmitter identifying device  1800  is also configured to, in response to receipt of an identifier request transmitted from the querying device, generates a transmitter notification based on the first identifier associated with the second identifier in the memory, and transmit the transmitter notification to the querying device  1300 . Advantageously, the system  1000  enables an identification of an identifier transmitter  17  (and hence, the service provider using the identifier transmitter  17 ) of which the mobile device  1300  is within range, after the first identifier corresponding to the identifier transmitter  17  is associated with the second identifier corresponding to the mobile device  1300  in the memory  1600 . 
     It is envisaged that the transmitter identifying device  1800  is typically implemented by a computing device such as a computer server (which may be located remotely or via “cloud computing”), a desktop personal computer; a portable computer (such as a laptop computer, a notebook computer or a tablet computer), or a mobile computing device (such as a smartphone), a programmable circuit etc. Persons skilled in the art will appreciate that the transmitter identifying device  1800  may be implemented by multiple computing devices such that each computing device implements only a part or parts of the transmitter identifying device  1800 , 
       FIG. 6  is a schematic diagram of the physical architecture of an embodiment of the system  1000 . The system  1000  comprises a transmitter identifying device  1800  connected to a transmitter identifying device memory  1600  and a network  15  in the form of the Internet. The system  1000  also comprises a plurality of identifier transmitters  17  for use by respective service providers in the form of respective taxi drivers. In this embodiment, the system  1000  takes advantage of the iBeacon arrangement, the Passbook application (which in an alternative embodiment may be a proprietary application provided or supplied by a service provider such as a taxi company or a PSP), and each of the identifier transmitters  17  is an iBeacon that is adapted to broadcast notifications within a taxi using a short range communication standard in the form of either BLE or Bluetooth Smart. As indicated above in respect of the method and system for enabling a payment, the use of BLE or Bluetooth Smart by an identifier transmitter  17  is advantageous in that it enables the transmitter identifier  17  to have a range (as illustrated by the dotted lines surrounding the identifier transmitter  17  in  FIG. 6 ) that is suitable for broadcasting signals within a taxi, a maximum data rate that is high enough for broadcasting iBeacon signals (about 1 megabits-per-second), and relatively low peak current consumption (about 15 milliamperes). It is envisaged that the identifier transmitter  17  and the mobile device  1300  may not be compatible with the Passbook application in an alternative embodiment, and may alternatively or additionally be compatible with an equivalent application such as Google Wallet in an alternative embodiment. 
     In this embodiment, the system  1000  also comprises a mobile device  1300  in the form of an iPhone for use by a user in the form of a passenger in the taxi, and the mobile device  1300  and the transmitter identifying device  1800  are in wireless communication with the network  15  via a cellular data communication network in the form of a LTE network. It is envisaged that the mobile device  1300  and the transmitter identifying device  1800  may alternatively be connected by a wireless local area network such as Wi-Fi in an alternative embodiment. 
     The system  1000  also comprises a querying device that is arranged to send an identifier request requesting the transmitter identifying device  1800  for an identification of one of the plurality of identifier transmitters  17  used by the respective service providers. In this embodiment, the mobile device  1300  is also the querying device. However, it is envisaged that the querying device may be another device such as another mobile device. 
     It is envisaged that an alternative embodiment of the system  1000  may comprise more than one mobile device  1300 , just one identifier transmitter  17 , and/or more than one transmitter identifying device  1800 . Also, it is envisaged that an alternative embodiment of the system  1000  may take advantage of an arrangement other than the iBeacon arrangement such that notifications from one or more of the identifier transmitters  17  may not be broadcast using BLE or Bluetooth Smart as specified by the iBeacon arrangement, but using other short range communication standards as specified by an alternative arrangement. In this respect, a person skilled in the art will appreciate that any alternative communication standard having a suitable range (for example, one having a range of at least 1 meter, or one having a maximum of about 100 meters) to broadcast the notifications within a taxi to a passenger of the taxi may be used. Examples of such alternative communication standards include other mobile or cellular data communication standards such as UMTS. It is also envisaged that other communication methods such as barcodes or QR codes may be used in alternative embodiments. Also, persons skilled in the art will appreciate that the transmitter identifying device memory  1600  may be implemented by a single device (for example, as part of the transmitter identifying device  1800 ) or by separate devices. 
     The system  1000  comprises a number of functional components for identifying one of the identifier transmitters  17 . It is envisaged that the functional components are typically implemented by a processor of a device executing program code and data stored in a memory of the device. However, persons skilled in the art will appreciate that this need not be the case. For example, one or more of the components could be implemented in an alternative manner, for example, as a dedicated circuit.  FIG. 7  is a schematic diagram showing the functional components of the system  1000 . In  FIG. 7 , only one of the identifier transmitters  17  is shown. 
     Beginning first with the functional components of the mobile device  1300  of the system  1000 , the mobile device  1300  comprises a processor  3900  and a communication interface  3800 , The processor  3900  of the mobile device  1300  is arranged to implement functional components in the form of a broadcast identifier matcher  3100 , an information request generator  3300 , an identifier notification generator  3500 , and an identifier request generator  3700  based on program code and data stored in a memory (not shown in  FIG. 7 ) of the mobile device  1300 . In this embodiment, the functional components implemented by the processor  3900  are provided by a combination of a proprietary application provided by a service provider and the Passbook application. That is, each one of the functional components is provided by the Passbook application, the proprietary application, or a combination of the Passbook application and the proprietary application. It is envisaged that the components may be provided in some other way in an alternative embodiment. For example, in an alternative embodiment, the functional components may all be provided by a proprietary application. 
     As indicated above, the identifier transmitter  17  is adapted to broadcast notifications using BLE or Bluetooth Smart as specified according to the iBeacon arrangement. In particular, the identifier transmitter  17  is arranged to broadcast a first identifier in the form of an identifier (a transmitter identifier) of the identifier transmitter  17  over a BLE or Bluetooth Smart communication channel. In this embodiment, the transmitter identifier is a taxi driver ID. However, it is envisaged that the identifier transmitter  17  may alternatively be an identifier of the taxi, or any identifier corresponding to either an identifier transmitter  17  or a user of an identifier transmitter  17  in an alternative embodiment. 
     In use, the transmitter identifier is associated with the identifier transmitter  17  before the transmitter identifier is broadcast by the identifier transmitter  17 . In this embodiment, the transmitter identifier is an identifier stored in association with information relating to the identifier transmitter  17  in the transmitter identifying device memory  1600 . In this embodiment, the information relating to the identifier transmitter  17  is information relating to a taxi driver. However, it is envisaged that the information relating to the identifier transmitter  17  may alternatively be information relating to a taxi or some other information in an alternative embodiment. 
     In this embodiment, the transmitter identifier is provided to the identifier transmitter  17  by connecting the identifier transmitter  17  to the transmitter identifying device  1800 , and outputting the transmitter identifier together with the information relating to the identifier transmitter  17  from the transmitter identifying device  1800  to the identifier transmitter  17 . It is envisaged that the transmitter identifier may be associated with the identifier transmitter  17  in other ways. For example, the transmitter identifier may be an identifier that is predetermined (that is, previously assigned to the identifier transmitter  17  without any setup by the manufacturer of the identifier transmitter  17 ) in an alternative embodiment. In such an alternative embodiment, the transmitter identifier may be outputted from the identifier transmitter  17  to the transmitter identifying device  1800 , and the predetermined transmitter identifier may be associated with information relating to the identifier transmitter  17  stored in the transmitter identifying device memory  1600  after connecting the identifier transmitter  17  to the transmitter identifying device  1800 . 
     The mobile device  1300  is adapted to monitor the BLE or Bluetooth Smart communication channel for receipt of a broadcast of a transmitter identifier. As indicated above, the mobile device  1300  is an iPhone with the Passbook application (or proprietary application in an alternative embodiment) installed in the mobile device  1300 . In this embodiment, the Passbook application (or proprietary application in an alternative embodiment) monitors the BLE or Bluetooth Smart communication channel for receipt of a broadcast signal that includes a broadcast identifier in the form of a UUID and the transmitter identifier. It is envisaged that, in an alternative embodiment, the broadcast signal may include other identifiers such as a taxi driver ID, a taxi ID, or both a taxi driver ID and a taxi ID. 
     The communication interface  3800  of the mobile device  1300  is adapted to receive the broadcast signal broadcast from the identifier transmitter  17 . The broadcast identifier matcher  3100  of the mobile device  1300  is adapted to, upon receipt by the communication interface  3800  of the mobile device  1300  of the broadcast signal, determine whether the broadcast identifier (that is, the UUID) of the broadcast signal matches or corresponds to a designated broadcast identifier (that is, a designated UUID). The broadcast identifier matcher  3100  is also arranged to, in response to a determination by the broadcast identifier matcher  3100  that the UUID of the broadcast signal corresponds to a designated UUID, display an identifier request in the form of a notification to display the information relating to the identifier transmitter  17  corresponding to the transmitter identifier of the broadcast signal transmitted by the identifier transmitter  17 . As indicated above, the broadcast matcher  3100  may be implemented by a proprietary application or the Passbook application depending on the embodiment. 
     The information request generator  3300  of the mobile device  1300  is arranged to, upon receipt by the mobile device  1300  of a user input from the user of the mobile device (that is, the passenger of the taxi) to display the information relating to the identifier transmitter  17 , Generate an information request comprising the transmitter identifier of the broadcast signal received from the identifier transmitter  17 , and control the communication interlace  3800  to transmit over a communication channel through the LTE network and the Internet  15  to the transmitter identifying device  1800  the information request to request for the information relating to the identifier transmitter  17 . As indicated in greater detail below, the transmitter identifying device  1800  is arranged to respond to the information request with the information relating to the identifier transmitter  17 . 
     The identifier notification generator  3500  of the mobile device  1300  is arranged to, upon receipt of the information relating to the identifier transmitter  17  by the communication interface  3800  of the mobile device  1300 , generate an identifier notification comprising the transmitter identifier of the broadcast signal received from the identifier transmitter  17  and the mobile device identifier, and to control the communication interface  3800  of the mobile device  1300  to transmit the identifier notification over the communication channel through the LTE network and the Internet  15  to the transmitter identifying device  1800 . The identifier notification generator  3500  is also arranged to control the mobile device  1300  to display to the user of the mobile device  1300  the information relating to the identifier transmitter  17  via the Passbook app (or alternatively via a proprietary application provided or supplied by a service provider such as a taxi company or a PSP, an equivalent app such as Google Wallet or a web browser app in an alternative embodiment). 
     As indicated above, in this embodiment, the mobile device  1300  is also a querying device that requests the transmitter identifying device  1800  for an identification of one of the plurality of identifier transmitters  17 . In use, it is envisaged that such a request or query would typically be made sometime after association of the transmitter identifier and the mobile device identifier has been made. That is, it is envisaged that there will normally be a time delay between the time when a transmitter identifier has been associated with a mobile device identifier and when an identification of the identifier transmitter  17  corresponding to the associated transmitter identifier is requested. The identifier request generator  3700  of the mobile device  1300  is arranged to generate an identifier request comprising the mobile device identifier, and to control the communication interface  3800  to transmit the identifier request to the transmitter identifying device  1800 . In this embodiment, the identifier request is transmitted by the querying device (that is, the mobile device  1300 ) over a communication channel through the LTE network and the Internet  15  to the transmitter identifying device  1800 . 
     The communication interface  3800  of the mobile device  1300  is also arranged to receive from the transmitter identifying device  1800  a transmitter notification including the information relating to the identifier transmitter  17 . As discussed in greater detail below, the transmitter notification is generated based on a transmitter identifier associated with the mobile device identifier in the transmitter identifying device memory  1600 . It is envisaged that the transmitter notification may include other information. For example, in an embodiment where the information relating to the identifier transmitter  17  is information relating to a taxi driver, the transmitter notification may additionally include information relating to a taxi corresponding to the taxi driver. The mobile device  1300  is also arranged to, upon receipt of the transmitter notification, display information derivable from the transmitter notification on a webpage via a web browser application implemented by the mobile device  1300 . It is envisaged that the information may be alternatively displayed, for example, by another application implemented on the mobile device  1300 , for example, the proprietary application provided or supplied by the transmitter identifying device  1800 , the Passbook application, Google Wallet etc. 
     Depending on the embodiment, the identifier request, the information request and the identifier notification may be transmitted over the same communication channel through the LTE network and the Internet  15  connecting the mobile device  1300  to the transmitter identifying device  1800 , or over different communication channels, through different network or networks, or over different communication channels and through different network or networks. For example, any one or more of the identifier request, the information request and the identifier notification may alternatively be transmitted through a wireless local area network (rather than the LTE network) and the Internet  15 . 
     Turning now to the functional components of the transmitter identifying device  1800  of the system  1000 , the transmitter identifying device  1800  comprises a processor  8900  and a communication interface  8800 . The processor  8900  of the transmitter identifying device  1800  is arranged to implement functional components in the form of an identifier associator  8500 , a transmitter notification generator  8700 , and a transmitter information generator  8300  based on program code and data stored in the transmitter identifying device memory  1600  connected to the transmitter identifying device  1800 . 
     The communication interface  8800  of the transmitter identifying device  1800  is adapted to receive the information request transmitted from the mobile device  1300 , the identifier notification transmitted from the mobile device  1300 , and the identifier request transmitted from the querying device (which is the mobile device  1300  in this embodiment). The transmitter information generator  8300  is arranged to, in response to receipt by the communication interface  8800  of the information request transmitted from the mobile device  1300 , generate information relating to the identifier transmitter  17  (that is, information relating to the driver of the taxi) by locating and retrieving the information relating to the identifier transmitter  17  from the transmitter identifying device memory  1600  based on the transmitter identifier of the information request received from the mobile device  1300 , and control the communication interface  8800  to transmit the information relating to the identifier transmitter  17  to the mobile device  1300 , The identifier associator  8500  is arranged to, in response to receipt by the communication interface  8800  of the identifier notification transmitted from the mobile device  1300 , associate the transmitter identifier of the identifier notification with the mobile device identifier of the identifier notification in the transmitter identifying device memory  1600  connected to the transmitter identifying device  1800  (for example, by storing the mobile device identifier against a data record corresponding to the transmitter identifier in the transmitter identifying device memory  1600 ). The transmitter notification generator  8700  is adapted to, in response to receipt by the communication interface  8800  of the identifier request transmitted from the querying device (which is the mobile device  1300  in this embodiment), generate a transmitter notification based on the transmitter identifier associated with the mobile device identifier of the identifier request (for example, by locating and retrieving from the transmitter identifying device memory  1600  the transmitter identifier associated with the mobile device identifier of the identifier request, and generating a transmitter notification comprising the retrieved transmitter identifier), and control the communication interface  8800  to transmit the transmitter notification to the querying device. 
       FIG. 8  is a flow chart of an embodiment of the method of identifying one of a plurality of identifier transmitters, carried out using the system of  FIGS. 1 and 2 . At step  800 , a designated UUID is defined for enabling an identification of any one of the plurality of identifier transmitters  17  of the system  1000 . At step  880 , each identifier transmitter  17  is provided or supplied with the designated UUID. In this embodiment, the designated UUID is provided to each identifier transmitter  17  by connecting the identifier transmitter  17  to the transmitter identifying device  1800  and outputting the designated UUID from the transmitter identifying device  1800  to each identifier transmitter  17 . Each identifier transmitter  17  is a standalone device (specifically, an iBeacon) located in a taxi in this embodiment. However, as indicated above, it is envisaged that each identifier transmitter  17  may not be a standalone device. For example, as indicated above in respect of  FIGS. 1 to 5 , each identifier transmitter  17  may be connected to a device of a service provider in the form of an iPhone. In this respect, it is also envisaged that, each identifier transmitter  17  may not be an iBeacon, but an iPhone with a proprietary application installed in the phone in an alternative embodiment. 
     At step  890 , a broadcast signal comprising a broadcast identifier in the form of a UUID and an identifier of the identifier transmitter  17  (that is, the transmitter identifier) is broadcast by the identifier transmitter  17 . As indicated above, the identifier transmitter is an iBeacon, and the broadcast signal is broadcast using a BLE or Bluetooth Smart communication channel. As indicated above, it is envisaged that the identifier transmitter may not be an iBeacon, and the broadcast signal may alternatively or additionally be broadcast using other communication channels such as a Wi-Fi communication channel or NFC. 
     As indicated above, a proprietary application and the Passbook application are installed on the mobile device  1300  in this embodiment. At step  900 , the Passbook application installed on the mobile phone  1300  monitors a communication channel in the form of a BLE or Bluetooth Smart communication channel for receipt of a broadcast signal from an identifier transmitter  17  (that is, an iBeacon), the broadcast signal comprising a broadcast identifier in the form of a UUID, and a transmitter identifier. 
     At step  910 , the broadcast identifier matcher  3100  implemented by the processor  3900  of the mobile device  1300  (which depending on the embodiment could be part of the Passbook application or the proprietary application installed in the mobile device  1300 ) determines whether or not the UUID of the broadcast signal matches or corresponds to the designated UUID provided or supplied to each of the identifier transmitters  17  at step  800 . If the mobile device  1300  determines that the UUID of the broadcast signal does not match or correspond to the designated UUID, the mobile device  1300  monitors the communication channel for receipt of another broadcast signal. Otherwise, if the mobile device  1300  determines that the UUID of the broadcast signal matches or corresponds to the designated UUID, the broadcast identifier matcher  3100  controls the mobile device  1300  to display an identifier request in the form of a notification (such as a pop-up window if the mobile device  1300  is being currently in use, or a notice on a lock screen displayed by the mobile device  1300  if the mobile device  1300  is not currently in use) to display information relating to the identifier transmitter  17  (for example, a notification to display via the Passbook application a pass comprising information relating to the driver of the taxi). As indicated above, it is envisaged that the information relating to the identifier transmitter  17  may include other information including information relating to the taxi, an affiliated transportation company, PSP etc. As indicated above, it is envisaged that, in an alternative embodiment, the information relating to the identifier transmitter  17  may be displayed by a proprietary application that is provided or supplied by a service provider and is installed on the mobile device  1300 . In this respect, it is envisaged that the information relating to the identifier transmitter  17  may not only include information relating to the driver of the taxi, but also other information such as information relating to a service provider such as a taxi company. 
     At step  920 , the mobile device  1300  receives an input from the user (that is, a passenger in the taxi) using the mobile device  1300  to display via either the Passbook application or the proprietary application information relating to the identifier transmitter  17  that is broadcasting the broadcast signal at step  890 . If the mobile device  1300  does not receive an input to display the information relating to the identifier transmitter  17 , the mobile device  1300  continues to display the notification to display information relating to the identifier transmitter  17  that is broadcasting the broadcast signal at step  890 , until the mobile device  1300  no longer receives the broadcast signal from the identifier transmitter  17 . 
     Otherwise, upon receipt by the mobile device  1300  of the input from the user of the mobile device  1300  to display the information relating to the identifier transmitter  17  at step  920 , the information request generator  3300  of the processor  3900  of the mobile device  1300  generates an information request comprising the transmitter identifier of the broadcast signal received from the identifier transmitter  17  that is broadcasting the broadcast signal at step  890  and controls the communication interface  3800  to transmit the information request to the transmitter identifying device  1800  to request the transmitter identifying device  1800  for the information relating to the identifier transmitter  17  at step  923 . The information request is then received by the communication interface  8800  of the transmitter identifying device  1800 . Upon receipt of the information request by the transmitter identifying device  1800 , the transmitter information generator  8300  implemented by the processor  8900  of the transmitter identifying device  1800  then generates the information relating to the identifier transmitter  17  corresponding to the transmitter identifier of the information request received from the mobile device  1300 , and controls the communication interface  8800  of the transmitter identifying device  1800  to transmit the generated information to the mobile device  1300 . 
     At step  925 , the information relating to the identifier transmitter  17  is received by the communication interface  3800  of the mobile device  1300 . 
     At step  930 , upon receipt of the information relating to the identifier transmitter  17  by the communication interface  3800  of the mobile device  1300 , the identifier notification generator  3500  of the mobile device  1300  controls the mobile device  1300  to generate a identifier notification comprising the transmitter identifier of the broadcast signal received from the identifier transmitter  17  and an identifier (a mobile device identifier) corresponding to either the mobile device  1300  or the user of the mobile device  1300 . The identifier notification generator  3500  then controls the communication interface  3800  to transmit the identifier notification over a communication channel through the LIE network and the Internet  15  to the transmitter identifying device  1800 . 
     At step  940 , the identifier notification transmitted by the mobile device  1300  is received by the communication interface  8800  of the transmitter identifying device  1800 . The identifier associator  8500  of the transmitter identifying device  1800 , upon receipt of the identifier notification transmitted by the mobile device  1300 , associates the transmitter identifier of the identifier notification with the mobile device identifier of the identifier notification by storing the transmitter identifier of the identifier notification in association with the mobile device identifier of the identifier notification in the transmitter identifying device memory  1600  connected to the transmitter identifying device  1800 . At or around the same time, the identifier notification generator  3500  of the mobile device  1300  controls the mobile device  1300  to display the information relating to the identifier transmitter  17  that was received at step  925 . 
     At step  950 , the mobile device  1300  receives an input from a user of a querying device (which in this embodiment is the user using the mobile device  1300 ) to request the transmitter identifying device  1800  for an identification of one of the plurality of identifier transmitters  17  used by the respective service providers. Upon receipt of the input by the mobile device  1300  for the identification of one of the plurality of identifier transmitters  17 , the identifier request generator  3700  of the mobile device  1300  generates an identifier request comprising the mobile device identifier at step  960 . Then, the identifier request generator  3700  controls the communication interface  3800  to transmit the generated identifier request from the mobile device  1300  to the transmitter identifying device  1800 . As indicated above, it is envisaged that the identifier request may include other information, for example, information about why identification of one of the identifier transmitters  17  is requested. As indicated by the dotted lines in  FIG. 8 , the input from the user is subsequently received by the mobile device  1300  sometime after association of the transmitter identifier and the mobile device identifier has been made at step  940 . Thus, there is a time delay between the time when a transmitter identifier has been associated with a mobile device identifier and when an identification of the identifier transmitter  17  corresponding to the associated transmitter identifier is requested. 
     At step  970 , the communication interface  8800  of the transmitter identifying device  1800  receives the identifier request from the mobile device  1300 , and the transmitter notification generator  8700  of the transmitter identifying device  1800  retrieves from the transmitter identifying device memory  1600  the transmitter identifier associated with the mobile device identifier of the identifier request received from the mobile device  1300 . Then, the transmitter notification generator  8700  generates transmitter notification based on the transmitter identifier associated with the mobile device identifier, and controls the communication interface  8800  of the transmitter identifying device  1800  to transmit the transmitter notification to the querying device which in this embodiment is also the mobile device 1300 , in order to thereby enable the querying device (that is, the mobile device  1300  in this embodiment) to identify the identifier transmitter  17  (and hence the service provider using the identifier transmitter  17 ) of which the mobile device  1300  is within range. 
     Further aspects of the method of  FIGS. 3 to 5  and/or the method of  FIG. 8  will be apparent from the above description of the system. Persons skilled in the art will also appreciate that either one or both of the methods could be embodied in program code. The program code could be supplied in a number of ways, for example on a tangible computer readable medium, such as a disc or a memory (for example, that could replace part of memory) or as a data signal (for example, by transmitting it from a server). 
     Similarly, it will be appreciated that data in memory (such as the data in the payment processor memory and/or the transmitter identifying device memory) can be supplied on any appropriate tangible data carrier, such as by writing them to a portable device (such as a USB drive), storing them in a memory (including transmitting identifiers to a device having a memory) etc. 
     Modifications within the scope of the invention may be readily effected by those skilled in the art. It is to be understood, therefore, that this invention is not limited to the particular embodiments described by way of example hereinabove. 
     It is to be understood that, if any prior art is referred to herein, such reference does not constitute an admission that the prior art forms a part of the common general knowledge in the art in any country. 
     In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, that is to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.