6.2.5 Price service

The price service calculates the price of a selection of products and considers all discounts. Discounts may be gained on various vendor-specific options, like time of the day, expiry date of the product, availability of product, customer and discount programs, etc. A Vending Machine according to this specification needs to have access to exactly one price service. This price service may internally use other price services (see Annex B).

The price service provides its interface by implementing an instance of the PriceServiceType (shown in Figure 14, defined in 7.24). The price service does not require OPC UA Client functionality to access other components of the Vending Machine.

The PriceServiceType provides the identification of the payment service in the Identification Object, defined in OPC 10000-100. The configuration of the payment service is provided by the Configuration Object of BaseConfigurationType defined in 7.3. The configuration may be writable via the OPC UA interface to change the configuration of the payment service. The PriceInformation Object of PriceInformationType defined in 7.11 provides price information for deliverables of products potentially provided by various Vending Machines. The optional Components Object of BaseComponentsType defined in 7.4 can provide information about subcomponents of the payment service.