6.2.3 Standalone Payment Devices
As stated in 6.2.2, a payment device may be managed in a proprietary manner by the payment service. A standalone payment device is a payment device, that has a standardized OPC UA Server. It is responsible to receive money, either via a physical asset (coin, bill, or token), as a payment cash device, or cashless as a payment cashless device. It provides the information about the received money and mechanisms to payout money. It interacts with the payment service and the audit collect. A Vending Machine according to this specification may have zero to many standalone payment devices.
As there are different types of payment devices, the type hierarchy is shown in Figure 12.
The standalone payment device provides its interface by implementing an instance of a subtype of the StandalonePaymentDeviceType (shown in Figure 12, defined in 7.17), which is an abstract subtype of the PaymentDeviceType used in the payment service. The standalone payment device does not require OPC UA Client functionality.
The PaymentDeviceType provides the identification of the payment device in the Identification Object, defined in OPC 10000-100. The configuration of the standalone payment device is provided by the Configuration Object of BaseConfigurationType defined in 7.3. The optional Components Object of BaseComponentsType defined in 7.4 can provide information about subcomponents of the standalone payment device. The payment device generates Events of VendingAuditEventType to provide audit data.
The abstract PaymentCashDeviceType defined in 7.18 defines common functionality for cash-based payment devices like the supported assets and the capability to payout cash. The concrete PaymentCoinDeviceType defined 7.19 represents standalone payment devices handing coins and / or token, with no additional functionality. The concrete PaymentBillDeviceType defined in 7.20 represents standalone payment devices handling bills and / or token, and provides additional functionality like cancelling the payout. The concrete PaymentCashlessDeviceType defined in 7.21 represents standalone payment devices handling cashless money, and provide the corresponding functionality.